The utility model provides a full-automatic injection molding product burr trimming machine. When the full-automatic injection molding product burr trimming machine works, a fastener is fixed at the center of a clock shell; a PLC controls a conveyor belt to move a product to the tail end of the conveyor belt and then controls a clamping device to move above the tail end of the conveyor belt; a second air cylinder acts so that a whole supporting frame moves downwards along a slide rail; a connection rod is pushed to move downwards under the action of a first air cylinder so that a claw on a claw mounting seat is driven to opened, then the first air cylinder and the second air cylinder are reset respectively, and the claw grasps the fastener on the clock shell at the tail end of the conveyor belt, and thus the clock shell is grasped and the supporting frame is reset; the clamping device moves above the burr trimming machine and a driving device of a pulley is started; the pulley drives the burr trimming machine to rotate around the clock shell on the guide rail; and meanwhile, a polishing wheel is used for polishing and removing burrs at the edge of the lock shell, the burrs on a product can be completely removed, traces are not remained at the original point, and the technical problems in the prior art are overcome.