The utility model discloses an insulation combined sleeve screwdriver, which solves the problem that the existing device cannot tighten a terminal strip screw of a relay protection device. The insulation combined sleeve screwdriver comprises a screwdriver handle (1), wherein the top end of the screwdriver handle (1) is provided with a sleeve seat (2), a pin support (3) is arranged on the screwdriver handle (1), a pin (4) is movably arranged on the pin support (3), a tail part socket pin (6) is arranged on the tail part of a lengthened cutter bar (5), a head part socket pin (7) is arranged on the head part of the lengthened cutter bar (5), a cutter bar fixing pin groove (8) is arranged in the middle part of the lengthened cutter bar (5), a socket hole (10) is arranged on the tail part of a tool bit (9), a tool bit fixing pin groove (11) is arranged in the middle part of the tool bit (9), and both the screwdriver handle (1) and the lengthened cutter bar (5) are respectively provided with an insulation layer. Due to the adoption of the insulation combined sleeve screwdriver, the screw tightening operation can be faster and better completed in a narrow space.