The invention provides a three-dimensional printer with a
polishing function. The three-dimensional printer comprises a base, a supporting frame, a rotary table, a lifting device, a worktable, a printing device and a
polishing device, wherein the supporting frame is arranged on the base, the rotary table is mounted on the base in a rotating manner, the lifting device is arranged on the rotary table, and the worktable is horizontally arranged on the lifting device; the printing device comprises a printing
nozzle, a feed
pipe, a material storing box, a
positive pressure device and a negative pressure device, wherein materials in the material storing box can be fed to the printing
nozzle through the feed
pipe by the
positive pressure device, and negative pressure can be provided for the material storing box by the negative pressure device, so that the materials in the printing
nozzle and the feed
pipe flow into the material storing box back; the
polishing device comprises a fixing base, a connecting rod, a polishing head and a first driving mechanism, wherein the fixing base is mounted at the top end of the supporting frame in a sliding manner, the first driving mechanism is connected with the fixing base, the connecting rod is positioned under the fixing base, the first end of the connecting rod is connected with the fixing base, and the second end of the connecting rod is connected with the polishing head.