The utility model relates to an electric power tool technical field, concretely relates to connecting device is changed to insulator, including installing the supporting part on two yoke plates, this supporting part is provided with the fixed knot who is connected with two yoke plates to be constructed, the supporting part extends and forms the extension end to the two yoke plate borders outside, this extension is served to be provided with and is used for and turns over the forced section that the integrated circuit board is connected, the structural style of two yoke plates of the device make full use of, make the integrated circuit board that turns over that uses among the prior art, hydraulic pressure lead screw and closed card are rather than the cooperation, provide suitable stress point for turning over the integrated circuit board, thereby accomplish the change to the first piece insulator of cluster wire side in the transmission line trigeminy, the blank of the first piece insulator of cluster wire side in leading to to change has been compensatied owing to adopt socket -clevis eye, the device having the advantages of simple structure, easy installation, effective solve the problem, and cooperate other current multiplexer utensils to change exploding the insulator certainly ingeniously, with the safety and stability operation factor who improves the direct current circuit.