Four-station particulate matter filter

The utility model relates to the technical field of gas detection, and provides a four-station particulate matter filter which comprises a particulate matter filter body, four connecting holes are formed in the particulate matter filter body, a filter membrane is further arranged on the particulate matter filter body, and the filter membrane is arranged in front of the connecting holes in the gas outflow direction. The particulate matter filter is provided with a first opening, a second opening, a third opening and a fourth opening; the first opening, the second opening, the third opening and the fourth opening are respectively formed in the four connecting holes; the electromagnetic valve is arranged on one side of the particulate matter filter and comprises four inlets and an outlet, the four inlets communicate with the first opening, the second opening, the third opening and the fourth opening correspondingly, and when the electromagnetic valve works, one of the four inlets communicates with the outlet; th