Workpiece quick-changing mechanism of mining machinery metal processing slotting machine

The utility model discloses a workpiece quick-changing mechanism of a mining machinery metal processing slotting machine, which comprises a base, a main shaft is rotatably arranged on one side of the top of the base, a three-jaw chuck is fixedly arranged on the top of the main shaft, a mounting seat is fixedly arranged on the other side of the top of the base, and an electric telescopic rod is fixedly arranged on one side of the top of the mounting seat. The output end of the electric telescopic rod is fixedly provided with a material changing head, one side of the material changing head is fixedly provided with a magnetic attraction stone, the two ends of one side of the base are each fixedly provided with two supporting legs, and after the headmost raw material reaches the interior of the material changing device, the electric telescopic rod is pushed forwards to drive the material changing head to penetrate through a penetrating opening, so that the magnetic attraction stone adsorbs the first raw material;