The utility model discloses a protection against electric shock alarm device is maintained to high pressure dolly cubical switchboard has solved the problem that non - safety zone is gone into to easy mistake in high tension switchgear maintains. It is provided with dolly switch static contact (2) to include in cubical switchboard box (1), be provided with guide rail (4) and dolly switch moving contact (3) on box bottom plate (7) of dolly switch static contact (2) one side, be provided with infrared transceiver of horizontal direction and the infrared transceiver of direction from top to bottom respectively on the medial surface of four curb plates of the box apart from dolly switch static contact (2) safe distance (L) the outside, be connected with audible -visual annunciator (14) on infrared emission reception control unit (13). The utility model discloses mode warning site operations personnel with acousto -optic warning keep beyond safe distance with dolly switch static contact, prevent accident of human electric shock's emergence.