The invention relates to a high-efficiency and low-consumption recycling and treating method for urban sewage, belonging to the technical field of treating and reusing the urban sewage, which aims to solve the problem of poor effects of dephosphorization and denitrogenation in prior art. The recycling and treating method in the invention is characterized in that: first, biological phosphorus removal is conducted for the pretreated sewage, meanwhile, the organic substance is also removed; then, the biological autotrophic denitrogenation is carried out, thus completing the recycle and treatment of the sewage. The biological autotrophic denitrogenation can be implemented in six ways: first, the sewage with the phosphorus removed biologically enters a nitrous acid biofilter, and then enters an ANAMMOX activated sludge reactor; second, the sewage enters a nitrous acid activated sludge reactor and subsequently enters an ANAMMOX biofilter; third, the sewage enters the nitrous acid biofilter, and then enters the ANAMMOX biofilter; fourth, the sewage enters the nitrous acid activated sludge reactor before entering the ANAMMOX activated sludge reactor; fifth, the sewage enters a single-segment biofilter reactor; and sixth, the sewage enters a single segment activated sludge reactor. The recycling and treating method for urban sewage in the invention has the advantages of good effect of sewage treatment, and low treatment costs.