The invention discloses a juicer comprising a main control unit, a juicing assembly and a juice receiving part. The juice receiving part is provided with a first deep ultraviolet sterilization module comprising a first deep ultraviolet light source, a first shielding cover and a first driving unit. The first driving unit drives the first shielding cover to shield or expose a light emitting side of the first deep ultraviolet light source, and good disinfection, sterilization and bacteriostasis effects are guaranteed. According to a disclosed juicing method, after juice is squeezed, the juice contained in the juice receiving part is irradiated by deep ultraviolet light and stirred. In the process that the juice is irradiated by the deep ultraviolet light, the juice is stirred, so that the juice can be uniformly irradiated by the deep ultraviolet light, and sterility is ensured. According to the disclosed juicing method, after the juice is squeezed, air in the juice receiving part is exhausted by an evacuating device, the juice is prevented from being oxidized, moreover, the juice can further be subjected to disinfection, sterilization and bacteriostasis through the deep ultraviolet light, and the juice can retain freshness for a long time.