The invention relates to an urban sewage treatment technology for standard surface quasi IV-class water. A system is included and comprises a water inlet pump room, a grit basin, a primary sedimentation tank, an improved MBBR biochemical pool, a secondary sedimentation tank, an efficient sedimentation tank, a filter tank and a disinfecting tank; the water inlet pump room is provided with a coarsescreen, the grit basin is provided with a fine screen, the biochemical pool comprises an anaerobic pool, an anoxia pool and an aerobic pool, the primary sedimentation tank is arranged above the anoxiapool, the drainage end of the aerobic pool is connected to the secondary sedimentation tank, and the aerobic pool is provided with a nitration solution flow back pipe communicated with the anoxia pool; the efficient sedimentation tank comprises a concrete region, a magnetic powder mixing region, a flocculation region and a sedimentation region; the filter tank is provided with a fiber filter material for filtering purified sewage and a back flushing device for cleaning the fiber filter material; the disinfecting tank is provided with a disinfecting device. The system combines the secondary biochemical technology and the depth treatment technology, the units are elaborately and reasonably designed and combined, and the water outlet water quality in a sewage treatment plant and outflow water in the aspect of black and odorous river way sewage interception and source control can reach the surface quasi IV-class water standard.