The invention discloses an automatic chain feeding and perforating device, and relates to the technical field of chain production machinery. The automatic chain feeding and perforating device comprises a work frame. A mobile work tank is fixedly connected with the middle of a side of the inner wall of the work frame, a movable cavity is fixedly connected with the top of the mobile work tank, a mobile motor is fixedly connected with a side of the inner wall of the mobile work tank, a worm gear is rotationally connected with an output shaft of the mobile motor, a worm is connected with the side,which is far away from the mobile motor, of the worm gear in a meshing manner, penetrates the mobile work tank and extends out of the mobile work tank, a support frame is fixedly connected with the bottom of the worm by a mounting frame, and a rotary arm is rotationally connected with the support frame by a connecting shaft and is close to the worm. The automatic chain feeding and perforating device has the advantages that a drill bit can be positioned and fixed under the control, a transmission platform can be supported under the control, a clamping device can move under the control, chainscan be clamped by the clamping device under the control, accordingly, the work efficiency can be improved, the labor cost and the production cost can be reduced, and automation progress can be improved.