The invention provides a device for automatically removing rim burrs. The device is formed by a machine frame (1), gears (2), racks (3), a fixed supporting plate (4), a guide rail (5), a left sliding plate (6), a clamping air cylinder(7), vertical columns (8), clamping wheels (9), a rotary cutter plate (10), guide columns (11), a movable supporting plate (12), upper air cylinders (13), a servo motor (14) and a right sliding plate (15). The device is characterized in that the clamping wheels (9) are fixed to the vertical columns (8), the two vertical columns (8) are fixed to the left sliding plate (6), the other two vertical columns (8) are fixed to the right sliding plate (15), and the left sliding plate (6) is structurally connected with the right sliding plate (15) through the gears (2) and the racks (3). The device can meet the requirement of automatic removal of burrs on a rim on the outer side of a wheel, the automation degree is high, the takt is short, efficiency is high, the burr removal effect is good, labor cost is reduced, and labor intensity is relieved. The device has the advantages of being compact in structure, stable in running, easy to operate and the like.