11. The non-transitory storage media according to claim 10 , wherein the system for preprocessing the print document further comprises a system scheduling unit, the document inputting unit comprises a document inputting functional module, and step A comprises: step A1, obtaining, by the document inputting functional module, the print documents that have not yet been printed and providing the obtained print documents to the system scheduling unit.
10. A non-transitory storage media storing computer programs for performing preprocessing on print documents that have not yet been printed by a printing plant by using a system realized by a computer, wherein when the computer programs stored in the non-transitory storage media are called and executed, a document inputting unit, a document processing unit, and a document outputting unit are realized, wherein the document processing unit comprises one or more document processing sub-units, each of the one or more document processing sub-units comprises a document checking functional module and a document processing functional module so as to cause the computer to enable the computer programs stored in the non-transitory storage media to carry out the following steps: step A, receiving, by the document inputting unit, print documents that have not yet been printed; step B, performing processing, by the document processing unit, on the print documents that have not yet been printed and are received by the document inputting unit, wherein step B comprises: step B1, determining, by a system scheduling unit, whether there is a document processing sub-unit that has not yet processed the print documents that have not yet been printed among the one or more document processing sub-units, if yes, then step B2, submitting, by the system scheduling unit, the print documents that have not yet been printed to the document processing sub-unit that has not yet processed the print documents that have not yet been printed for processing, otherwise, then step C; step B2 further comprises: step B11, determining, by the document checking functional module, whether the print documents that have not yet been printed comply with a specified standard, if yes, then step C, otherwise, step B12, determining, by the document checking functional module, whether a problem that a part of the print documents that have not yet been printed and do not comply with the specified standard can be solved by the document processing functional module, if yes, step B13, performing processing on the print documents that have not yet been printed and do not comply with the specified standard so as to cause them to comply with the specified standard by the document processing functional module, then step C, otherwise, step B14, terminating the method and step C, outputting, by the document outputting unit, print documents that have been processed by the document processing unit.