The invention discloses an efficient grinding device for engineering plastic raw material processing. The efficient grinding device for the engineering plastic raw material processing comprises an extrusion box, wherein a supporting seat is in bolted connection with the center of an inner cavity of the extrusion box, a sliding sleeve is embedded in the center of an inner cavity of the supporting seat, a speed adjusting button is in bolted connection with the right side of the front face of the extrusion box, a feeding cylinder communicates with the left side of the extrusion box, and the left side of the top of the feeding cylinder communicates with a feeding hopper. Through cooperation of a low-speed motor and a feeding auger, engineering plastic raw materials can be rapidly fed, so that the engineering plastic raw materials are conveyed and fed at a constant speed, and the situation that the engineering plastic raw materials are stacked and blocked in the feeding process is avoided; through the cooperation of a stepper motor, a reducer, a rotating shaft, a cam, a pulley, a sliding column, a reset spring, an extrusion base and extrusion teeth, the engineering plastic raw materials can be subjected to primary pre-extrusion treatment, the engineering plastic raw materials are crushed and extruded in a reciprocating gravity downward pressing mode, the structures of the engineering plastic raw materials are directly damaged, and preparation is made for secondary grinding of the engineering plastic raw materials.