High-sensitivity gas leakage alarm

The utility model discloses a high-sensitivity gas leakage alarm which comprises a shell internally provided with a cavity, a fan-shaped box body is detachably installed at the bottom of the inner wall of the cavity, a ventilation groove is formed in the center of the top of the fan-shaped box body, a carbon tetrachloride solution is arranged in the fan-shaped box body, a ventilation net is fixedly installed in the ventilation groove, and a gas outlet is formed in the middle of the ventilation net. A methane concentration sensor used for detecting methane concentration is fixedly installed in the middle of the top of the inner wall of the shell, a base is detachably installed in the middle of the top of the outer edge face of the shell, and a buzzer alarm is fixedly installed in the middle of the top of the base. A storage battery, a controller and a wireless transmitter are fixedly installed at the top of one side of the inner wall of the cavity, the methane concentration sensor is electrically connected wit