The invention provides a water-free urinal and a drainage system for a bathroom. The water-free urinal and the drainage system have the advantages that internal spaces are arranged between a urinal inner wall and a urinal outer wall and are used for collecting gas which volatilizes from urine, reaction can be carried out on oxygen in the air and gas which volatilizes from the urine, has peculiar smell and includes ammonia by the aid of catalysts on the walls of the internal spaces, and accordingly the peculiar smell can be eliminated; projection of a first liquid outlet and projection of a second liquid outlet on a horizontal plane along the vertical direction are not overlapped with each other, accordingly, the gas which volatilizes from the urine can flow into the internal spaces along the outer side of the inner wall or the inner side of the outer wall, and peculiar smell diffused out from the first liquid outlet can be reduced; the urinal can keep dry by the aid of hydrophobic coatings, and accordingly bacteria breeding can be prevented; the service cost of the water-free urinal can be reduced, the peculiar smell can be reduced to reach acceptable level, and diffusion of the peculiar smell can be thoroughly prevented by a turning cover and an activated carbon filter element inside the turning cover.