The invention designs a special automatic honing machine for compressor piston processing. The special automatic honing machine comprises a working platform; the working platform is provided with an upright column, a drill bit mounting seat, a piston mounting mechanism and a horizontal rail; the upright column is fixedly connected with the working platform; the drill bit mounting seat is connected with the upright column through a ball screw and is provided with a plurality of drill bits; the ball screw is driven by a first servo motor; the horizontal rail is fixed on the working platform; and the piston mounting mechanism is composed of a plurality of piston mounting seats, can carry out reciprocating motion along the horizontal rail and is driven by a second servo motor. The piston mounting mechanism is driven by the servo motor to carry out reciprocating motion along the horizontal rail to be matched with vertical reciprocating motion of the drill bit mounting seat, the special automatic honing machine realizes automation processing of a piston, can process pistons with six being one group, has a simple structure and is saving in time for operation and high in accuracy.