The utility model relates to the field of air disinfection. A device for air disinfection containing a housing with inlet and outlet windows, a UV radiation source in the spectral range of 205-315 nm, located inside the housing, protective screens located in front of the inlet and outlet windows, a device operation control unit, a fan installed in the outlet window housing and a filter installed in the entrance window of the housing, characterized in that inside the device housing along the UV radiation source, at least two diffusion screens are additionally installed, each of which consists of three parts made in one piece, where the lower part of the screen is made in the form a plate with a hole in the center, the outer edge of which is close to the wall of the case, the central part of the screen is made in the form of a hollow truncated cone, placed on the plate in the center, the diameter of the lower base of which is larger than the diameter of the upper base and corresponds to the diameter of the hole on the plate, the upper part of the screen is made in the form of a hollow cylinder, placed on the upper base of the central part of the screen, which, in combination with the lower and upper protective screens, form a labyrinth system that excludes the passage of a direct bactericidal flow of UV radiation outside the device body, as well as ensuring the pressing of the flow of disinfected air to the UV source when passing through each diffusion screen at a distance sufficient to obtain the dose of UV radiation necessary for inactivation of microorganisms and reducing the degree of hydraulic resistance to the air flow, while the device for air disinfection contains a switching device for turning on and off the device without disconnecting the power cord from the mains, while on the device body for air disinfection, there are elements for fixing the device to a wall or stand. The utility model improves the efficiency of the device for air disinfection, including
