The invention discloses a multi-welding-spot alloy powder coating mechanism for a spot welding process. The multi-welding-spot alloy powder coating mechanism comprises a support device, a linear sliding device and at least one discharging device. The discharging devices are arranged on the linear sliding device. The linear sliding device is mounted on the support device through a lifting device in a liftable manner. According to the multi-welding-spot alloy powder coating mechanism, alloy powder enters corresponding discharging holes through hard discharging pipes and falls into a to-be-welded region below the discharging holes, different welding spots of the to-be-welded region correspond to the different discharging holes, the coating thickness of the alloy powder is uniform, the coating quality is high, and the welding effect is improved greatly; and furthermore according to the difference of the positions of to-be-welded regions, the positions of all the discharging devices can be adjusted by the linear sliding device, and the height of the discharging devices can be adjusted through the lifting device, so that the different discharging requirements are met.