Air duct germicidal lamp

The utility model relates to the technical field of sterilization and disinfection, in particular to an air duct sterilization lamp which comprises an installation base, a UV lamp tube and an installation piece, the installation base is provided with an end face, one end of the UV lamp tube is fixedly arranged on the end face of the installation base, and the other end of the UV lamp tube extends in the direction away from the installation base. The mounting sheet is arranged on the periphery of the UV lamp tube in a sleeving manner; the mounting piece is provided with at least two first positioning parts and at least two through holes, and the first positioning parts extend and protrude towards the mounting seat along the axial direction of the mounting piece; and a connecting hole is formed in the end surface of the mounting seat corresponding to the first positioning part. The design of additionally arranging the mounting piece is adopted, the through hole and the preformed hole in the outer wall of the ai