In order to overcome the defect that the existing urinal wastes water source and can not deodorize, the invention provides a water-saving deodorant cover of a urinal. The center of the water-saving deodorant cover of a urinal is provided with a round ridgy plastic or metal skeleton and a round water falling port the size of which is slightly bigger than that of the urinal, the outside is adhered with one layer of sponge with equivalent density, and the skeleton is hidden in the sponge. After a person urinates, urine seeks below from the gap of the sponge, water washing water pressure is used to press urine below the sponge, and clean water is naturally kept in the sponge to perfume the action of sealing and isolating odour. Because of the hygroscopy of the sponge, water can be kept for quite a while in the sponge, and the processes are repeated to obtain the effect of water saving and odour prevention of the urinal so as to effectively avoid wasting water resource and avoid polluting public environment by urine odour.