This invention disclose a sort of manufacturing method of multirole TiO2 haydite photocatalyst with tridimensional nanometer structure and nanometer effect, which was easy to reclaim and renewable duty-cycle operation. It was calcining at 600 degree centigrade for 6 hours, which used 7 - 8nm anatase titanium dioxide as raw material and water as moulding agglomerant. The photocatalyst constitute with 14 - 16nm grain and 74.85% ventage. Among others, nanometer meta- hole occupy 29.41%, average pore size is 20.73nm and major pore distribution is 3 - 16nm.Specific area is 58.43m2/g, capacity is 0.9697g/cm3, with V-class isothermal adsorption type, did not spall soaking in water for 20 days. dissipate rate<5%.;Using this catalyzer on the hospital sewage , for 3 hour light-catalyzed reaction , the sterilization toward colibacillus can reach to 99%, which overpassed then powder catalyzer visibility. The invention which is not only adapts to laboratory, but also for industrialization application, no damage to environment and humanity, it is a sort of method that friendly prepares nanometer construction material towards environment.