Gas collecting device

According to the gas collection device provided by the invention, the plurality of pressure control pipelines are arranged, each pressure control pipeline is internally provided with one pressure regulating valve, and the pressure regulating valves can set the gas flow pressure value in the pressure control pipelines according to actual requirements, so that the gas flow pressure value in each pressure control pipeline can be regulated to the required gas flow pressure value. Each pressure control pipeline can be connected to a gas source outlet through at least one three-way valve, one three-way valve is provided with two gas outlets, a plurality of three-way valves can be provided with a plurality of gas outlets, and when each gas outlet is connected with one pressure control pipeline, the collecting device can supply gas to various types of sampling tanks. The controller can control the states of the three-way valve and the inlet automatic valves at the inlets of the sampling tanks and control the sampling