Combined type constant torque wrench

The invention provides a combined constant-torque wrench, and belongs to the field of bolt tightening tools. According to the technical scheme, the screwdriver comprises an electric screwdriver or a pneumatic screwdriver, a connector, a locking nut and a preset torque screwdriver, one end of the connector is connected with an output shaft of the electric screwdriver or the pneumatic screwdriver, and the other end of the connector is fixedly connected with the rear end of a handle of the preset torque screwdriver. Further, an external thread is machined at the rear end of the handle of the preset torque screwdriver, an internal thread is arranged on the connector, and the connector is in threaded connection with the rear end of the handle through matching of the internal thread and the external thread and is locked through a locking nut. The torque control device is easy to implement, low in cost and high in torque control precision, the torque control precision depends on the torque control precision of a pre