A digital torque wrench mainly comprises a transmission rod of wrench body provided in a handle, and a tool head provided at the exterior of the handle. An abutment surface on the other end of the transmission rod is to abut with one end of a lever arm. A roller is provided on the other end of the lever arm, and a rolling member opposite to the roller is also provided. A latch member on an actuator is inserted between the roller and the rolling member. Further, a controller is coupled with the actuator and a torque sensing element.