The utility model belongs to burr -grinding machine tool field discloses a burring device, burring device include hydraulic motor, shaft coupling, bearing, big synchronous pulley, hold -in range, little synchronous pulley, inner chamfering sword, outer chamfer sword, wherein, hydraulic motor links to each other with the shaft coupling, the shaft coupling links to each other with the bearing, the bearing links to each other with big synchronous pulley, big synchronous pulley links to each other with the hold -in range, the hold -in range links to each other with little synchronous pulley. The utility model discloses a burring device can carry out the burring to the steel pipe terminal surface of different materials, makes the steel pipe terminal surface after processing more smooth simultaneously, accords with the qualified standard of product. It drives the rotation of inside and outside chamfer sword to rotate through the hydraulic motor drive axle. When the steel pipe burring, it is different according to the material of steel pipe, use different kinds of cutters. Has the advantage that the burring is effectual, area is little.