Welding die of vibration friction welding machine

The utility model discloses a welding die of a vibration friction welding machine. The device comprises a positioning template, first sliding grooves are formed in the two sides of the positioning template, electromagnets are arranged at the bottoms of the first sliding grooves, fixing devices capable of moving in the length direction of the first sliding grooves are arranged in the first slidinggrooves, and each fixing device comprises an abutting part used for fixing a workpiece and a linkage part used in cooperation with the corresponding electromagnet. According to the welding die of thevibration friction welding machine, due to the fact that the first sliding groove and the fixing device capable of being movably matched with the first sliding groove are arranged, the fixing device can slide in the first sliding groove, and therefore workpieces of different sizes can be fastened through the fixing device. And meanwhile, through cooperation between the abutting part and the linkage part and strong attracti