Gas detection device with gas pressure detection and compensation functions

The utility model relates to the field of gas detection devices, in particular to a gas detection device with gas pressure detection and compensation functions, which comprises a detection box and a gas collection bottle, a connecting pipe is arranged at the bottom of the detection box, a gas detection device is mounted on the connecting pipe, a gas pressure meter is mounted on the gas detection device, and a first electromagnetic valve is mounted on the connecting pipe. When the detection device is used, gas to be detected is guided into the detection box and is influenced by the piston plate and the first electromagnetic valve, the detection box is in a closed state, the barometer is used for judging the internal gas pressure, and the cylinder is used for driving the piston plate to lift, so that the closed space between the detection box and the piston plate is enlarged or reduced, and the gas pressure is reduced or increased; the air pressure is compensated and adjusted to enable the internal air pressure