The invention relates to a constant-effluent variable-load SVBR sewage processing technology. The technology comprises the following steps: introducing sewage into an inflow and sludge reflux well, primarily processing the sewage by a grating, then mixing the sewage with reflux sludge, transporting the sewage to an anaerobic and primary sedimentation zone by a lifting pump, then processing the sewage in an AO biological processing area, further purifying the sewage and carrying out primary sludge-water separation in an anoxic and pre-sedimentation zone, finally carrying out final sludge-water separation in a secondary sedimentation and effluent zone, disinfecting the effluent by a tube-type ultraviolet disinfector, and discharging the disinfected effluent out of the system. Through the optimized combination of various functional zones and the circulating reflux design, the sewage processing technology allows the inflow rate and the water level and load in the reactor to change within a designed range, the effluent rate of the system always remains relatively constant and continuous, and the processing process is a continuous non-stable process. The sewage processing technology integrates the functions of lifting, modulating, primary settlement, biological degradation, secondary settlement, and sludge reflux in one tank, has the characteristics of little occupied area and equipment, and simpleness in operation and management, and is especially applicable to the sewage treatment in small towns.