shēnqǐngcáiliào dōu qíquán le.

申请材料 means application materials or application documents.

• 申请 = to apply / application
• 材料 = materials, documents, supporting paperwork

In this sentence, 材料 is not talking about physical raw materials in the usual English sense. It refers to the set of documents or items you need for an application, such as forms, certificates, photos, and so on.

都 usually means all.

In 申请材料都齐全了, it shows that all of the application materials are complete. The idea is:

• every required document is there
• nothing is missing

Even though 申请材料 is one phrase, it refers to a collection of items, so 都 is natural.

A rough sense is:

• The application materials are all complete now.
• All the application documents are in order now.

齐全 means complete, all there, or nothing missing.

It is often used when talking about a set of things that should all be present, for example:

• documents
• equipment
• parts
• information

So 齐全 does not just mean good or finished. It specifically means the set is complete and everything needed is present.

The final 了 shows a change of state or a newly relevant situation.

So 申请材料都齐全了 suggests something like:

• previously, the materials may not have been complete
• now they have become complete

A natural English feeling is:

• The application materials are all complete now.
• Now all the application documents are ready.

Without 了, the sentence sounds more like a plain description. With 了, it often sounds like a situation has changed or a process has reached a new stage.

Yes, you can say 申请材料都齐全.

That would sound more like a general statement or description:

• The application materials are all complete.

With 了:

• 申请材料都齐全了
• The application materials are all complete now / have become complete.

So both are possible, but 了 adds the sense of completion or change.

Because 齐全 is an adjective, and in Mandarin, adjectives can directly serve as the predicate.

So:

• 申请材料都齐全了 = natural

But:

• 申请材料都是齐全的 can be possible in some contexts, but it is less direct and not the normal basic form here
• 申请材料都是齐全了 would sound wrong

Mandarin often does not need a word like to be before an adjective. That is different from English.

It is mainly an adjective.

In this sentence, it works as the predicate adjective:

• 申请材料 = the application materials
• 都 = all
• 齐全 = complete
• 了 = now / has become so

So the sentence structure is basically:

subject + 都 + adjective + 了

都 usually comes before the predicate, not directly after the noun in English-style logic.

So Mandarin says:

• 申请材料 都 齐全 了

not:

• 申请材料 齐全 都了 or anything like that

A helpful pattern is:

Topic/subject + 都 + predicate

Examples:

• 人都到了。 = The people have all arrived.
• 作业都写完了。 = The homework is all finished.
• 申请材料都齐全了。 = The application materials are all complete now.

Yes. In conversation, people sometimes say:

• 申请材料都齐了。

Here, 齐 is a shorter, more colloquial way to express the idea that everything is there.

But 齐全 sounds a bit more formal and is especially natural for documents, paperwork, or official situations. Since 申请材料 is a formal phrase, 都齐全了 fits very well.

They are similar, but not identical.

• 齐全 = all required items are present; nothing is missing
• 完整 = whole, intact, not damaged, not broken up

For documents, 齐全 is often the better word if you mean all the required pieces have been submitted.

For example:

• 材料齐全 = all the documents are there
• 资料完整 = the information/document is complete as a whole

Sometimes both can work, but 齐全 strongly focuses on having every required item.

It can function like a collective noun.

Chinese nouns usually do not have a built-in singular/plural marking like English does. So 申请材料 can mean:

• application material
• application materials
• application documents

In this sentence, because of 都 and the meaning of 齐全, the sentence clearly refers to a set of items, so English will usually translate it as application materials or application documents.

Yes, it sounds fairly formal or at least neutral-formal.

Words like:

• 申请
• 材料
• 齐全

are very common in official, administrative, school, visa, or business contexts.

You might hear this from:

• a staff member at an office
• a university administrator
• a visa clerk
• a company HR person

It is a very useful sentence pattern for real-life paperwork situations.