A juice squeezing module for a juicer adapted to be mounted on a body of the juicer with a driving shaft of a driving motor protruding upward therefrom to perform a juice squeezing operation, the juice squeezing module comprising: a juice squeezing drum mounted on the body of the juicer in such a manner as to be open on the top surface thereof and having a juice discharging hole and a remnant discharging hole formed on the lower end periphery thereof and an engagement gear disposed on the edge of the periphery of the bottom surface thereof; a cap adapted to cover the top surface of the juice squeezing drum and having an injection hole formed on the top side thereof; a juice squeezing screw rotatably mounted at the inside of the juice squeezing drum and having screw spiral lines formed on the outer peripheral surface thereof and a power connector disposed on the underside thereof in such a manner as to be connected to the driving shaft; a screen drum mounted at the inside of the juice squeezing drum and having a screen structure as the outer peripheral wall thereof; a rotating brush disposed between the juice squeezing drum and the screen drum in such a manner as to rotate and brush the inner peripheral surface of the juice squeezing drum and the outer peripheral surface of the screen drum and having a brush ring gear mounted on the underside periphery thereof in such a manner as to be connected to the engagement gear; characterised in that it further comprises brush rotating means disposed on the underside of the juice squeezing drum to transmit the driving force of the driving shaft of the body of the juicer to the engagement gear to rotate the rotating brush; and a brush rotating means cover coupled to the underside of the juice squeezing drum to cover and support the lower portion of the brush rotating means, wherein the brush rotating means is disposed between the underside of the juice squeezing drum and the brush rotating means cover coupled to the underside of the juice squeezing drum. a juice squeezing drum mounted on the body of the juicer in such a manner as to be open on the top surface thereof and having a juice discharging hole and a remnant discharging hole formed on the lower end periphery thereof and an engagement gear disposed on the edge of the periphery of the bottom surface thereof; a cap adapted to cover the top surface of the juice squeezing drum and having an injection hole formed on the top side thereof; a juice squeezing screw rotatably mounted at the inside of the juice squeezing drum and having screw spiral lines formed on the outer peripheral surface thereof and a power connector disposed on the underside thereof in such a manner as to be connected to the driving shaft; a screen drum mounted at the inside of the juice squeezing drum and having a screen structure as the outer peripheral wall thereof; a rotating brush disposed between the juice squeezing drum and the screen drum in such a manner as to rotate and brush the inner peripheral surface of the juice squeezing drum and the outer peripheral surface of the screen drum and having a brush ring gear mounted on the underside periphery thereof in such a manner as to be connected to the engagement gear; brush rotating means disposed on the underside of the juice squeezing drum to transmit the driving force of the driving shaft of the body of the juicer to the engagement gear to rotate the rotating brush; and a brush rotating means cover coupled to the underside of the juice squeezing drum to cover and support the lower portion of the brush rotating means, wherein the brush rotating means is disposed between the underside of the juice squeezing drum and the brush rotating means cover coupled to the underside of the juice squeezing drum.