Combustible toxic gas alarm

The utility model discloses a combustible poisonous gas alarm, which comprises a combustible poisonous gas alarm assembly. The combustible poisonous gas alarm assembly comprises a poisonous gas alarm body. The protective anti-falling assembly comprises protective shells arranged on the two sides of the toxic gas alarm body, a hollowed-out installation frame fixed to inner cavities of the protective shells, a round long rod penetrating through the hollowed-out installation frame, a disc fixed to the top face of the round long rod, a spring connected between the disc and the hollowed-out installation frame, and an arc-shaped pressing piece connected to the bottom face of the round long rod. The first threaded hole is formed in the top surface of the protective shell; and the threaded rod penetrates through the first threaded hole. According to the utility model, through the mutual cooperation of the combustible toxic gas alarm structure and the protective anti-drop structure, the connection part of the combusti