A UV sterilization cup includes a cup body with a first opening thereof, a cup shielding covered on the first opening, a filter matched with the first opening, a UV sterilization member received in the cup shielding for sterilizing water and a waterproof transparent member received in the cup shielding for sealing the UV sterilization member. The UV sterilization member includes a UV PCB and a UV light source connected to the UV PCB. The UV PCB includes a UV generating circuit formed thereon to drive the UV light source to emit ultraviolet ray so as to sterilize water received in the cup body. The compact structure can achieve a reliable sterilization effect with 99.9% by setting the UV light source, and water fetched in outdoors can reach the standard of healthy drinking water that it is first filtered by the filter and then sterilized by the UV light source.
