Plasma mass spectrometer air filtering device

The invention relates to the technical field of air filtering, in particular to a plasma mass spectrometer air filtering device which comprises an air filtering mechanism, and the bottom of the air filtering mechanism is provided with a reciprocating replacement mechanism and a semi-rotary taking and placing mechanism. Thrust is generated by starting an air cylinder, a sliding seat and a linkage plate move on double sliding rails in a reciprocating mode, an auxiliary filtering channel and a first combined type filter screen mechanism are separated, sealing pressing force on a filter screen is relieved, then, the first combined type filter screen mechanism is clamped and rotated into a combined type filter screen storage box through a semi-rotating type taking and placing mechanism, and therefore the combined type filter screen storage box can be used for storing the combined type filter screen. According to the filter screen replacing device, the old filter screen set is taken down, then the semi-rotary takin