I found a part-time job in Zhaopin, and there was a "sign recycling contract" in it. What does this mean? Is this contract useful?

It's best to look at it first, and then don't sign the recycling contract easily. He usually asks you to pay a few hundred yuan for materials, and then you can get the materials back for processing. Even if it is completed, it may not meet his requirements. You may be asked to rework and do it endlessly until you lose patience. As a result, you will buy his expensive materials in cash, and his materials may cost more than ten yuan.