The invention discloses a novel water-saving water 
closet pan and mainly relates to the technical field of water 
closet pans. As for pedestal pans and squatting pans in modern urban families and public places, 
water consumption is high, the water waste is extremely serious, unclean flushing sometimes occurs, and unfavorable influences on public 
hygiene are caused. As for modern rural toilets, old open-type flushing-free toilets are dominant, 
environmental hygiene is 
extremely poor, and high 
water consumption of modern flushing water 
closet pans is greatly related to the phenomenon. A 
piston of the water closet pan can move relatively to a water closet pan port (the 
piston reaches the lower portion of the water closet pan port), 
human body excrement can be directly moved to a thick channel of the water closet pan to be rotated, the flushing 
water pressure of the water closet pan is high, therefore, a lot of water is saved, the flushing of the water closet pan is clean, a sewer is not prone to be blocked, a lower port of the water closet pan is sealed by the pistonto be isolated from outside space and a sewer lineeffects of air sealing are better than those of keeping water and sealing peculiar smell by drain traps in traditional water closet pans, meanwhile, collection and usage of 
human body excrement are facilitated, and the 
water content of the excrement is greatly reduced so that the collected 
substance content can be increased, and the 
workload is reduced.