NOVELTY - A solar anaerobic recirculation reactor comprises inflow water distribution chamber including water distributor, water pump, penetrating layer and supporting frame; granular sludge reaction chamber including tapered shell, granular sludge fluidized filler, exhaust pipe and water discharge pipe; precipitating filter chamber including water distribution pipe, cylindrical shell and bio-membrane filtering layer; sludge circulating system including slurry inflow and outflow pipes; 3-phase separator including gas collecting cover, and water collecting chute; and solar collector cover.    USE - Solar anaerobic recirculation reactor for sewage treatment with high concentration.    ADVANTAGE - The reactor improves biological degrading efficiency, reduces production cost, and improves water quality.    DETAILED DESCRIPTION - The solar anaerobic recirculation reactor comprises inflow water distribution chamber including water distributor, water pump, penetrating layer and supporting frame; granular sludge reaction chamber including tapered shell, granular sludge fluidized filler, exhaust pipe and water discharge pipe; precipitating filter chamber including water distribution pipe, cylindrical shell and bio-membrane filtering layer; sludge circulating system including slurry inflow and outflow pipes and slurry pump; 3-phase separator including gas collecting cover, water collecting chute, water discharge pipe and exhaust pipe; and solar collector cover including sunlight plate shell, vacuum chamber and heat absorbing layer. The inflow water distribution chamber is mounted on lower part of granular sludge reaction chamber. The precipitating filter chamber and granular sludge reaction chamber are embedded together to form concentric circles. The solar collector cover is mounted on upper part of the 3-phase separator. The granular sludge reaction chamber communicates with precipitating filter chamber by water discharge pipe. The inflow water distribution chamber communicates with granular sludge reaction chamber by water penetration layer.