Purifying device capable of efficiently sterilizing by ultraviolet light

The utility model relates to a purification device for efficient ultraviolet sterilization, which comprises a main shell capable of defining a flow channel for directional flow of gas to form gas flow and a mounting station of a functional module, and the functional module at least comprises a filter screen module and a multi-stage ultraviolet sterilization assembly. The filter screen module and the multi-stage ultraviolet sterilization assembly are installed in a shell cavity of the main shell in a partitioned mode in the axial direction of a flow channel limited by the main shell, and the filter screen module is located on the upstream of the multi-stage ultraviolet sterilization assembly; the input port and the output port of the main shell are each provided with an air guide turbine capable of driving air flow to directionally flow in a flow channel defined by the air guide turbines. The multi-stage ultraviolet sterilization assembly is provided with strip-shaped ultraviolet lamps in a staggered and space