The invention discloses a method for conducting copper infiltration on a 3D printed tungsten blank through tungsten powder fuse jetting, and relates to the technical field of 3D printing. The method comprises the steps of S1, raw material proportioning, S2, tungsten-based plastic wire manufacturing, S3, 3D printing, S4, high-temperature sintering, S5, copper infiltration, S6, heat treatment and S7, machining. Tungsten powder and a plastic-based material are mixed, a tungsten-based plastic wire is manufactured and is heated into a molten fluid through a wire feeder, jetting 3D printing is performed to obtain a designed tungsten blank, high-temperature sintering is performed on the tungsten blank, a plastic-based high-molecular material is removed, a porous tungsten blank is prepared, and copper infiltration is performed to obtain the required tungsten-copper part; according to the method, jetting 3D printing is adopted, the printing efficiency is relatively high, the printing equipment is simplified, and the printing cost is greatly reduced; the tungsten blank subjected to jetting printing is adopted, the method is close to a traditional tungsten powder pressing and sintering technology, the tungsten powder is not molten, and retained copper infiltration pores are uniform.