The invention relates to the technical field of membrane winding devices, and discloses a carrier-free membrane winding device. The carrier-free membrane winding device comprises a bottom plate and asupporting plate. A rotating seat is arranged on the supporting plate. A rotating shaft is arranged in the rotating seat. A winding roller is arranged at the right end of the rotating shaft. Multiplelong grooves are evenly formed in the circumferential face of the winding roller, and the long grooves are parallel to the axis of the winding shaft. A supporting strip is arranged in each long groove, and a supporting pin and a guide pin are arranged on the bottom face of each supporting strip. An ejector rod is arranged in a cavity, an electric cylinder is arranged at the left end of the rotating shaft, and the ejector rod and the inner wall of the rotating shaft are in sliding connection through a spline. A supporting sleeve is arranged at the position, corresponding to the supporting pins,of the outer side of the ejector rod, the right end face of the supporting sleeve is a conic face, the lower end faces of the supporting pins are connected with the conic face of the supporting sleeve in an abutting manner, and the lower ends of the guide pins and the ejector rod are connected through elastic inhaul cables. According to the carrier-free membrane winding device, when a membrane iswound, a carrier is omitted, no carrier is included in a finally-obtained membrane coil, and the carrier cost is omitted.