Labor-saving combined screwdriver with replaceable adapter

A labor-saving combined screwdriver with replaceable adapters relates to the technical field of hardware tools and comprises a sleeve, a connecting rod and a crank, spline grooves for mounting various adapters are formed in the top end of the sleeve, two ends of the connecting rod are hinged to the bottom end of the sleeve and the top end of the crank respectively, and two hinge shafts are parallel to each other and perpendicular to the axis of the sleeve. A guide mechanism is further arranged on the outer wall of the sleeve, and the position of the axis of the sleeve is controlled through the guide mechanism. The novel screw driver is novel in structure and convenient to use, not only can save physical power, but also can improve the screw mounting or dismounting efficiency, can control the axis of the sleeve to keep stable by arranging the guide mechanism, prevents the adapter from being separated from the notch of the screw, and can save the force for screwing the screw by arranging the crank, so that the