Ultraviolet sterilizer with self-cleaning function

The invention discloses an ultraviolet sterilizer with a self-cleaning function, and relates to the technical field of liquid sterilization, the ultraviolet sterilizer comprises a cleaning assembly, an axial driving assembly, a sliding block and a tube body, a plurality of lamp tubes sleeved with first sleeves are arranged in a liquid flowing cavity side by side, and a driving part of the axial driving assembly is arranged in the axis direction of the liquid flowing cavity; the cleaning assembly comprises a cleaning ring and a magnetic ring, the cleaning ring and the magnetic ring are integrated, and the second sleeve is slidably sleeved with the magnetic ring. The lamp tube outer sleeve cleaning device has the advantages that the magnetic sliding block magnetically drives the cleaning assembly acting on the lamp tube outer sleeve, and then regular cleaning of the lamp tube outer sleeve is achieved; the sterilization effect is ensured; the running time of the cleaning assembly is adjusted through the ultravio