Electric power twister

A torsion sensing piece and a gear motor are fixed together, an output shaft of the gear motor penetrates through the center of the torsion sensing piece to be connected with a bit set, the bit set is arranged at the front end of a shell, and a control circuit board and a power source are arranged in the shell. The torsion sensing piece comprises an outer ring, an inner ring, a connecting piece and a strain gauge, the outer ring is coaxially arranged on the periphery of the inner ring at intervals, the connecting piece is connected with the inner ring and the outer ring, the strain gauge is fixedly arranged on the connecting piece to form a measuring bridge, and the strain gauge is connected with the control circuit board; when the electric power twister works, the connecting sheet of the torsion sensing sheet is slightly deformed under the action of torque and then causes the change of the resistance value of the bridge, the change of the strain bridge resistance is converted into the change of an electric s