Air inlet purifier device of truck

The invention belongs to the technical field of tail gas treatment, and particularly relates to an air inlet purifier device of a truck. The air inlet purifier device comprises a retention box, wherein the upper surface of the retention box is sleeved with a purification cylinder in a threaded manner; an anti-backflow device is arranged on the inner wall of the purification cylinder and is used for blocking and purifying tail gas in the purification cylinder; the top wall of the inner side of the purification cylinder is sleeved with a support frame in a threaded manner; a first filter screenis fixedly arranged on the surface of the support frame; and a shaft center of the support frame is sleeved with an air inlet cylinder. According to the air inlet purifier device of the truck, the anti-backflow device is arranged, so that dust in the air is subjected to anti-backflow treatment, and the blockage caused by the dust is avoided; and the filtered dust off the air stays in engine oil, when the dust stays at the