High-strength square shaft winding drum

The invention provides a high-strength square shaft winding drum. The high-strength square shaft winding drum comprises a spindle, movable arc plates and a fixed arc plate. The cross section of the spindle is polygonal. The fixed arc plate is arranged on one face of the periphery of the spindle, and the movable arc plates are arranged on the other faces of the periphery of the spindle. The cross section of the spindle is square. Each movable arc plate is connected with one face of the spindle through a tapered iron. The movable arc plates and the spindle are all internally provided with sliding grooves. The tapered irons are arranged in the sliding grooves of the movable arc plates and the square spindle in a sleeved mode. The surface, making contact with each movable arc plate, of the corresponding tapered iron is a bevel. During operation, the end of a metal plate is put into a tong door, an adjustable clamp moves upwards to clamping the metal plate, and the tapered irons move in theaxial and radial directi