Electric wrench refers to an electric tool used to tighten and loosen bolts and nuts, and is a tool for tightening high-strength bolts. Used for the initial and final tightening of high-strength bolts with large hexagonal heads in the installation of steel structure bridges, factory buildings, chemical and power generation equipment, as well as the initial tightening of high-strength bolts with torsion shear type, and in situations where there are strict requirements for the torque or axial force of bolt fasteners.