The invention discloses a grinding machine capable of fixing different types of drum brake pads, and belongs to the technical field of brake pad processing. The grinding machine comprises a mounting rack and a grinding device, wherein a left telescopic post is installed in the left position of the top of a movable plate, a chute is formed in the right position of the top of the movable plate, a sliding block is arranged in the chute, a right telescopic post is installed on the top of the sliding block, a sleeve is installed on the top of the sliding block, a splicing column is installed on thetop of the right telescopic post, a tension spring is installed in an inner cavity of the sleeve, an adjusting device is connected to the left side of the tension spring, the right side of the tension spring is connected to the left side of the splicing column, fixed plates are vertically installed upwards on the left side of the sleeve and the right side of the splicing column respectively, andbayonets are formed in positions, which are close to the top, of one surface, which is close to a support device, of the fixed plates. The grinding machine has the advantages of convenience in use andsimplicity in operation, and brake pads of different sizes can be processed without an additional fixed mold, so that the processing cost is reduced.