The invention discloses a deburring device for a metal plate. The deburring device comprises a box body. First motors are fixedly connected to two sides of the bottom of the inner wall of the box body; the output shaft end of each of the first motors is in transmission connection to an automatic feeding device through a belt; a fixed box is fixedly connected to the top of the inner wall of the box body; a lower deburring device is connected to the bottom of the inner wall of the fixed box through a first double-drive motor; one side of the bottom of the inner wall of the fixed box is fixedly connected to a second motor; the output shaft end of the second motor is connected to an auxiliary conveying device through a belt; a lifting device is fixedly connected to the top of the inner wall of the fixed box; and an upper deburring device is connected to the bottom of the lifting device through a mobile plate. The invention relates to the technical field of metal processing. The deburring device for the metal plate disclosed by the invention feeds the metal plate automatically, so that participation of personnel in a processing course is reduced, and the labor force is reduced; double sides are deburred at the same time, so that the processing efficiency is increased and the time is shortened.