The utility model discloses a locking device for misoperation prevention of power system, including the connecting plate, prevent the mistake cover, the lockaid gun with install the base on the door plant, base movable mounting is on the door plant, terminal setting on the door plant is in the mounting groove at base center, the nut is installed through locking cylinder in the terminal top, install the lockplate through adjusting nut on the connecting plate between the fixed column lock, prevent the mistake and cover fixed mounting on the base, the lockaid gun symmetry is installed and is being prevented covering the top both sides by mistake, tapered end of connecting on the lockaid gun and the cooperation of the lock core of connecting axle, the connecting axle is installed on the base, the activity of connecting axle lower extreme lock foot sets up in the door plant. The utility model discloses simple structure, simple to operate, it is with low costs, can effectively prevent the operation of slipping up of electric wire netting device through the effect of preventing mistake cover and lockaid gun to the normal operating of electric wire netting has been guaranteed.