The utility model discloses a dolly for changing terminal box belongs to the electric power tool field, the trouble technical problem of terminal box dismouting among the solution prior art, the utility model provides a dolly, including the automobile body, the bottom of automobile body is equipped with the wheel, is equipped with the support frame on the automobile body, is equipped with the support arm that extends towards one side on the support frame, and the support arm is arranged in lifting the electrical apparatus mounting bracket of terminal box. The utility model discloses be applied to the dismouting to terminal box in the electric substation.