The utility model discloses a multi-purpose screw driver used for solving the problem that a single-tool bit screw driver can only tighten single-type screw spikes. A rotator is hinged to one end of a driver body, a first extension rod, a second extension rod, a first cap body and a second cap body are fixed to the rotator, the first cap body and the first extension rod are collinear, and the second cap body and the second extension rod are collinear; a fixing box is arranged on the driver body, a movable rod is movably installed in an inner cavity of the fixing box, a spring is arranged between the movable rod and the fixing box, and the guiding end of the movable rod lifts towards one side of the rotator under the function of the spring; a first sleeve is fixed to the free end of the first extension rod, and a first embedded body is plugged into an inner cavity of the first sleeve; a second sleeve is fixed to the free end of the second extension rod, a second embedded body is plugged into an inner cavity of the second sleeve, and tool bits are arranged in the small ends of the second embedded body and the first embedded body. The multi-purpose screw driver is simultaneously of a structure for fastening or disassembling screw spikes and nuts, the use is flexible, and the popularization is facilitated.