The utility model discloses a plate edge polisher with an adjustable clamp, which relates to the technical field of circuit board production and comprises a base, two supporting strips and damping grooves, the two supporting strips are symmetrically distributed at the top of the base, and the damping grooves are arranged in the two supporting strips; a protection plate is arranged at the top of the supporting strip, two symmetrically-distributed damping sliding blocks are fixedly connected to the bottom of the protection plate, the damping sliding blocks are slidably connected with the interior of the damping groove, a supporting frame is fixedly connected to one side of the protection plate, a clamping structure is arranged, and the driving strip drives the rotary disc to rotate. In the process, the rotating rod and the limiting rod rotate in the fixing frame at the same time, meanwhile, the clamping rods drive the clamping strips, the clamping strips drive the fixing rubber strips to move, and through the relative movement between the two fixing rubber strips, the fixing rubber strips can be clamped and fixed. And clamping operation on the plate is achieved.