Gas monitoring device

The utility model discloses a gas monitoring device which comprises a gas detector. The gas monitoring device further comprises a sample storage tank, a waste gas inlet pipe, a gas inlet pipe and a waste gas storage tank. The gas inlet pipe is connected with the sample storage tank, a check valve is arranged on the gas inlet pipe, the bottom of the sample storage tank is connected with a gas inlet of the gas detector through a pipeline, a stop valve is arranged on the pipeline, a gas outlet of the gas detector is connected with the waste gas storage tank through the waste gas inlet pipe, and a gas outlet pipe is arranged on the top face of the waste gas storage tank. By means of the check valve, the gas inlet pipe, the sample storage tank, the stop valve, the gas detector, the waste gas inlet pipe, the gas outlet pipe and the waste gas storage tank, monitoring on gas is achieved, neither a corresponding sensor nor a control device is needed, and therefore the manufacturing cost of the gas monitoring device is lower than that of an existing gas monitoring device.