Electric wrench capable of facilitating caliber adjustment

The invention discloses an electric wrench capable of facilitating caliber adjustment. The wrench comprises a main wrench body capable of twisting bolts or nuts as well as a handle connected with the main wrench body; the main wrench body comprises push rods, a base and a transmission mechanism for adjusting the push rods to move; thread holes in one-to-one correspondence with the push rods are formed in one perpendicular side of the base and are in threaded connection with the push rods; the transmission mechanism comprises a control system for producing electric drive; and the push rods are driven by the transmission mechanism to rotate by the aid of the control system and advance rotationally in cooperation with the thread holes. With the electric wrench, a motor is controlled by adjusting buttons on the outer side of the handle to drive an adjusting support rod, an adjusting screw drives a rotating base plate to rotate, thus, the push rods are driven to move, and through the restraint of the thread holes on the push rods, the push rods complete radial movement and advance rotationally along the thread holes. After clamping, the wrench has the self-locking effect, is not prone to slippage, can provide the relatively large clamping force and twisting support force and can reduce tool damage caused by the excessive twisting force.