The invention discloses a pole tower bolt electric torque wrench and a control method thereof. According to the current motor torque and the flux linkage, the motor torque and the flux linkage at thenext moment under different voltage vectors are predicted according to the Eulerian method and a mathematic model of a permanent magnetic synchronous motor, objective function values under the different voltage vectors are calculated according to a wrench target torque value, a stator target flux linkage value and the predicted motor torque value and the flux linkage value at the next moment, andthe voltage vector making an objective function optimal is selected as the voltage at the next moment. A traditional PI regulator is replaced through a prediction model of a stator current and the flux linkage, torque response is fast, and the pole tower bolt electric torque wrench is of good significance to fastening of a pole tower bolt; and by constructing the suitable objective function, everystep of control of a driving motor meets the optimal condition for controlling a target, and the output torque of the pole tower bolt electric torque wrench is controlled in a high-precision mode.