Fresh air ventilator with disinfection and sterilization functions

The fresh air machine comprises a machine body and a filtering assembly, an air inlet and an air outlet are formed in the two sides of the outer portion of the machine body respectively, a purification cavity and an exhaust pipeline are arranged in the machine body, the air inlet is communicated with the purification cavity, the purification cavity is communicated with one end of the exhaust pipeline, and the other end of the exhaust pipeline is communicated with the air outlet. The filter assembly is vertically arranged on one side in the purification cavity, an ultraviolet lamp tube is arranged on the other side in the purification cavity, baffles are arranged at the upper ends and the lower ends of the first filter screen piece and the second filter screen piece correspondingly, fixing blocks are arranged at the two ends outside the baffles correspondingly, the machine body is clamped outside the fixing blocks, and clamping grooves are formed in the fixing blocks. The two sides of the first filter screen p