The invention discloses an art knife assembling device, and belongs to the technical field of art knife production. The device comprises a bearing device, a loading device, a feeding device, a supplying device and a discharging mechanical arm; the bearing device comprises a bearing disc and a positioning jig located on the bearing disc, the loading device, the feeding device, the supplying deviceand the discharging mechanical arm are arranged at intervals in the circumferential direction of the bearing disc, the loading device comprises a loading assembly and a pushing assembly arranged at aninterval, one end of the loading assembly is in lap joint with the pushing assembly, the feeding device comprises a feeding assembly and a mounting assembly, the mounting assembly is located at the front end of the feeding assembly and is in sliding fit with the feeding assembly, the supplying device comprises a supplying assembly and a charging assembly, and the supplying assembly is located above the charging assembly and is fixedly connected with the charging assembly. The loading assembly and the pushing assembly are matched to convey a shell to the positioning jig, and the feeding assembly and the mounting assembly can mount blades and a knife pushing device on the shell precisely.