Automatic drawing system for leather drawing, characterized in that it comprises a drawing table and an automatic pen changing mechanism, the drawing table comprising a work table, a two-axis synchronous belt sliding table, a lifting mechanism, a feed mechanism, a press mechanism, a flat drawing mechanism and a drive mechanism, with the work table an opening is provided which allows leather to pass through, the feed mechanism being arranged at one end of the work table and serving to set up a leather roll, the clamping mechanism being arranged on the lower surface of the work table for firmly pressing one end of the leather wherein the pull-flat mechanism is slidably disposed on the work table and reciprocates under drive from the drive mechanism, the two-axis synchronous belt sliding table is disposed on the work table and the lifting mechanism is disposed on the two-axis synchronous belt sliding table is arranged and moves under drive from the two-axis synchronous belt sliding table in a horizontal plane, wherein the automatic pin changing mechanism is arranged on the lifting mechanism and moves vertically under drive from the lifting mechanism, the automatic pin changing mechanism a connection housing, an actuator , an upper cover, a rotary body and an elastic mechanism, wherein the connection housing is connected to a robot arm and a mounting space is provided within the connection housing, in which mounting space the rotation body is rotatably arranged, the lower end of the rotation body protruding beyond the connection housing and the Rotary body is provided around its center of rotation at the same distance with a plurality of mounting holes for attaching a pen, the elastic mechanism is arranged within the mounting hole with which de The pen is pushed up for movement so that the pen tip is hidden in the mounting hole and the upper end protrudes beyond the mounting hole, the upper cover being detachably connected to the connection housing and a push piece protruding downwards on the lower surface of the upper cover , the position of which is assigned to the mounting hole, the thrust piece being provided on both sides with a guide section connected to the upper cover, the actuator being arranged on the upper cover and releasably connected to the rotary body in order to drive the rotary body to rotate via the actuator.
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