A button error preventing protection device comprises a protection cover capable of being buckled on an electric equipment button and a fixed plate used for mounting the protection cover on a button panel. The fixed plate is a U-shaped plate with the side face fixed to the button panel, the top of the protection cover extends outwards to be provided with a mounting plate capable of stretching into a U-shaped groove of the fixed plate, and the head portion of the mounting plate is movably connected with the two side faces of the U-shaped groove through a rotary shaft. An opening is formed in the bottom face of the protection cover, the button can be exposed by rotating the protection cover upwards, round through holes used for mounting locking pins are oppositely formed in the bottoms of the two side faces of the protection cover, the locking pins are of a cylindrical structure capable of penetrating through the round through holes, a cylindrical handle with the diameter larger than that of the corresponding round through hole is arranged at one end of each locking pin, and hanging locks are arranged at the other ends of the locking pins. The button error preventing protection device is simple in structure and easy to mount and operate, equipment damage caused by illegal operation of the button can be avoided, and therefore the management level of a substation is improved, and safe running of electric equipment is guaranteed.