The invention provides a steel pipe straightening machine. The steel pipe straightening machine is technically characterized by comprising a fixed plate, a moving plate and a controller; a supporting frame is vertically arranged on the fixed plate; a top plate is horizontally arranged at the top end of the supporting frame; the controller is located on the upper surface of the top plate; an electric cylinder is fixed to the lower bottom face of the top plate; a lead screw of the electric cylinder faces downwards and is connected with the moving plate; the upper surface of the fixed plate is provided with a downward-sunken lower arc groove; the lower surface of the moving plate is provided with an upward-sunken upper arc groove; the upper arc groove and the lower arc groove correspond to each other vertically; a sensor is arranged on the fixed plate and connected with a master control chip on the controller through an A/D converter inside the controller; and the master control chip is connected with the electric cylinder through a driving circuit inside the controller. According to the steel pipe straightening machine, steel pipes at the high temperature can be extruded so as to be straightened, and the steel pipe yield is improved.