The invention discloses a document printer facilitating filing. The document printer comprises a storage plate, a
portal frame, a printing head, a lifting driving piece, a transverse movement driving piece, a lifting sensing module, a positioning module and a transverse movement sensing module. The
portal frame is fixed to the storage plate, the fixed end of the lifting driving part is slidably arranged on the
portal frame, the printing head is in transmission connection with the output end of the lifting driving part, the fixed end of the transverse moving driving part is arranged on the portal frame, and the output end of the transverse moving driving part is in transmission connection with the fixed end of the lifting driving part. The lifting sensing module is arranged on the printing head and the lifting driving piece, the lifting sensing module is in communication with the lifting driving piece, and the transverse movement sensing module is in communication with the transverse movement driving piece; the positioning module is arranged on the portal frame. The document printer can directly print the archiving information on the cover of the book, the book does not need to be disassembled and assembled repeatedly, and the archiving efficiency can be improved.