Air detection device for preventing lens pollution

The utility model relates to an air detection device capable of preventing lens pollution. The device comprises a polarization device and a dust sensor, the polarization device and the dust sensor arecommunicated with each other to form a detection channel for air circulation; wherein the dust sensor comprises a built-in light source, a detection head and a photoelectric sensor, the detection head is composed of a first detection lens and a second detection lens, the first detection lens and the second detection lens are symmetrically arranged in the dust sensor in a V shape, and the first detection head and the second detection head are electret in an electret mode and have the same polarity; the beneficial effects of the utility model are that: the utility model discloses are embodied in: the beneficial effect is: A detection lens on a traditional dust sensor is electret to have the same polarity in an electret mode, and the polarization device polarizes air to be detected, so thatair dust carries charges w