Ultraviolet sterilization device

The utility model relates to an ultraviolet sterilization device, which comprises a shell, an ultraviolet light source, an ultraviolet light source and an ultraviolet light source, wherein the shell is provided with a liquid inlet channel and a liquid outlet channel; the inner shell is arranged in the outer shell; the ultraviolet lamp module is arranged on the shell; wherein a cavity is defined by the inner shell and the ultraviolet lamp module, at least two annular channels are formed between the side wall of the outer shell and the side wall of the inner shell, and the cavity is communicated with the liquid inlet channel, the at least two annular channels and the liquid outlet channel, so that a flowing path for fluid to pass through is formed. According to the ultraviolet sterilization device provided by the utility model, the retention time of liquid in the ultraviolet sterilization device is prolonged, so that sterilization can be more effectively carried out, and the ultraviolet sterilization device is