The invention relates to the manufacturing field, and discloses a network 3D printing system and a usage method. The network 3D printing system comprises a server side, a client side and a printer side; the server side comprises a data operation device, a client interaction device, a printing interaction device, a printing data storage device and a client matching device; the client side comprisesa user interaction device, a service interaction device and a printing command storage device; and the printer side comprises a printing connection device, a data conversion device, a printing control device, a printing monitoring device and an attribute recording device. By means of organic data exchange of the server side, the client side and the printer side, all printers in the same work nature can fully exert the printing attributes of the printers, a printing task is completed with multiple printers executing the corresponding attributes when the printing task needs multiple different printing requirements, and the purpose of solving the problems that in the prior art, the usage frequency of the printers cannot be increased, and the intercommunity cannot be improved is achieved.