The utility model relates to a tool for regulation and maintenance of automobile moulds. A quick change device of a ball locking punch mainly comprises a clamping base body, a clamping sleeve, a handle, a spanner and a screw, wherein the handle is provided with a through hole inside; the front end of the handle is fixedly connected with the sleeve type clamping base body; the clamping sleeve is accommodated in the clamping base body; the screw is connected with the clamping sleeve through the through hole of the handle by threads; the front end of the clamping sleeve adopts a multi-flap type structure; and the screw is connected with the spanner through threads. The structural design of the quick change device breaks through the traditional operation mode of dismounting the punch by hands; the quick change device has the advantages of simple structure, reliability in clamping, no damage to size, shape and roughness precision of a mounting part of the punch, elimination of potential safety hazard in hand operation, and improvement in operation efficiency of mould regulation and maintenance.