Abstract: A wrench-attached screwdriver is comprised of a screwdriver portion, a wrench portion, and a connection part, in which the connection part is arranged for connecting the screwdriver portion with the wrench portion and for relaying the torque of the wrench portion to the screwdriver portion. When a high torque is required to lock a screw tight, a user is supposed to first twist the screw to a critical point with the screwdriver portion, then pull an auxiliary wrench up to apply torque on the screw, and an inverse procedure is to be performed for unlocking the screw vice versa.