Two-stage multi-channel atmospheric collection pipeline filtering system

The utility model relates to the technical field of pre-filtration of atmospheric online analysis, and discloses a two-stage multichannel atmospheric collection pipeline filtering system, which comprises a multichannel filtering unit, the multichannel filtering unit comprises a filter group with a plurality of filtering cavities, and an electromagnetic valve is arranged on each filtering cavity; and each electromagnetic valve independently controls the opening and closing sequence of the electromagnetic valves and the electromagnetic valve switching time interval through the controller, so that when one electromagnetic valve is in an open state, the other electromagnetic valves are in a closed state. And a cyclone filtering device is arranged in front of the multi-channel filtering unit toremove large-particle pollutants and liquid water in the gas sample. According to the utility model, the increase of the attenuation effect of a gas concentration high-frequency signal is avoided, the effective filtering tim