Vehicular gas detection device

The utility model relates to a vehicular gas detection device which mainly consists of a gas detection unit, a control unit and an alarm unit. The gas detection unit comprises sensing elements inside and outside a vehicle respectively; the sensing elements can detect the concentration of carbon monoxide in environment, and convert the concentration into digital signals which are transmitted to the gas detection unit; and the gas detection unit transmits the signals to the control unit when judging that the concentration of the carbon monoxide is higher, thus triggering the alarm unit to remind a user, or further switches off a power supply so as to stop the vehicle, and thus protecting the safety of the user.