The utility model provides a novel ultraviolet sterilizer, which belongs to the field of sterilizing appliances. The structure of the sterilizer consists of a cabinet, ultraviolet lamps, timers and sensors, wherein partitions divides the interior of the cabinet into a plurality of compartments, each of which is provided with a cabinet door, the cabinet doors are fixed on the cabinet by magnetic switches, the inner side of each cabinet door is provided with a sensor, the outer side of each cabinet door is provided with a timer and a handle, and the top in each compartment is provided with an ultraviolet lamp. Compared with the prior art, the utility model adopts the ultraviolet lamps for sterilization, which can quickly and effectively kill germs by way of close irradiation, different articles can be placed in different compartments, the ultraviolet lamps of different compartments can be separately controlled, and the sensors on the cabinet doors can sense the opening and closing statesof the cabinet doors at any time and react to protect the human body from being irradiated by ultraviolet rays.