Protective cover for improving spraying effect of insulating paint

The utility model discloses a protective cover for improving an insulating paint spraying effect. The protective cover comprises a movable annular shell, a non-movable annular shell and an opening and closing adjusting mechanism, a fixing groove is formed in the non-movable annular shell, an insulating paint spray head is installed in the fixing groove, and the central axis of the fixing groove can directly face a spraying area of the to-be-sprayed power equipment; the opening and closing adjusting mechanism comprises an L-shaped connecting piece, a driving assembly and a fixing piece, a longitudinal plate of the L-shaped connecting piece is connected with one end of the fixing piece, the other end of the fixing piece is fixedly connected with the non-movable annular shell, a protruding part is arranged at the upper end of the longitudinal plate of the L-shaped connecting piece, and the protruding part is movably connected with the bottom of the movable annular shell; the fixed end of the driving assembly is