A side paper feeding device for feeding side paper to manufacture paper cups, comprising: a shuttle cam rotating in conjunction with a drive shaft and driving a shuttle plate capable of transporting the side paper located on an upper part thereof to a paper cup forming device in a horizontal reciprocating direction; a driving cam module , formed on a lower part of the shuttle cam , including a rotary cam , an oscillator cam and links arms, wherein the rotary cam formed on a rotation shaft fixedly coupled to the shuttle cam intermittently rotates a first turret , wherein the oscillator cam formed on the rotation shaft oscillates a second turret , and wherein the link arms whose respective one side ends are coupled to a first end of a first shaft of the first turret and to a first end of a second shaft of the second turret are rotatably coupled to each other at respective other side ends thereof; and a side paper transporting arm module including an arm plate , rotating arms , sub-arms and a track cam , wherein the arm plate is coupled to one end of the first turret , wherein the rotating arms are rotatably coupled at equal intervals to an outer circumferential surface of the arm plate at respective one side ends thereof, wherein the sub-arms , where suction pads for holding and releasing the side paper by vacuum are formed, are fixedly coupled to respective other side ends of the rotating arms in a direction perpendicular to the rotating arms , and wherein the track cam coupled to a second end of the first shaft of the first turret allows the sub-arms to move reciprocally, on a plane of the outer circumferential surface of the arm plate , in a section between a first point where a specific suction pad among the suction pads holds the side paper from a magazine and a second point where the side paper is released on the upper part of the shuttle plate . a shuttle cam rotating in conjunction with a drive shaft and driving a shuttle plate capable of transporting the side paper located on an upper part thereof to a paper cup forming device in a horizontal reciprocating direction; a driving cam module , formed on a lower part of the shuttle cam , including a rotary cam , an oscillator cam and links arms, wherein the rotary cam formed on a rotation shaft fixedly coupled to the shuttle cam intermittently rotates a first turret , wherein the oscillator cam formed on the rotation shaft oscillates a second turret , and wherein the link arms whose respective one side ends are coupled to a first end of a first shaft of the first turret and to a first end of a second shaft of the second turret are rotatably coupled to each other at respective other side ends thereof; and a side paper transporting arm module including an arm plate , rotating arms , sub-arms and a track cam , wherein the arm plate is coupled to one end of the first turret , wherein the rotating arms are rotatably coupled at equal intervals to an outer circumferential surface of the arm plate at respective one side ends thereof, wherein the sub-arms , where suction pads for holding and releasing the side paper by vacuum are formed, are fixedly coupled to respective other side ends of the rotating arms in a direction perpendicular to the rotating arms , and wherein the track cam coupled to a second end of the first shaft of the first turret allows the sub-arms to move reciprocally, on a plane of the outer circumferential surface of the arm plate , in a section between a first point where a specific suction pad among the suction pads holds the side paper from a magazine and a second point where the side paper is released on the upper part of the shuttle plate . <EOS>