NOVELTY - An internal recycle anaerobic reactor (R1) comprises water distributing devices (1) arranged at bottom of columnar tank body (12), where central upright column (10) is arranged in tank body for connecting gas collector (3) located at center part and 3-phase separator (4). The gas collector is used for isolating tank body into upper reaction chamber and lower reaction chamber. The whirlwind water distributing devices (1) are arranged at bottom of tank body, where gas-liquid separators are arranged at upper side of 3-phase separator and whirlwind water distributing devices.    USE - Internal recycle anaerobic reactor (R1) is used for distributing water in whirlwind manner and separating whirlwind solution.    ADVANTAGE - The reactor (R1) is low in investment, has stable operation and high load processing, has good anti-impacting load and mass transmitting effect, and has high particle sludge activity and high in purity of generated methane.    DETAILED DESCRIPTION - Internal recycle anaerobic reactor (R1) comprises water distributing devices (1) arranged at bottom of columnar tank body (12), where central upright column (10) is arranged in tank body for connecting gas collector (3) located at center part and 3-phase separator (4) located at top in supporting manner. The gas collector is used for isolating tank body into upper reaction chamber and lower reaction chamber. The whirlwind water distributing devices (1) are uniformly arranged at bottom of tank body, where gas-liquid separators are arranged at upper side of 3-phase separator and corresponding place of whirlwind water distributing devices. The gas lifting pipes are arranged among gas-liquid separators, 3-phase separator and gas collector, where flow returning pipe is arranged among gas-liquid separators and whirlwind water distributing devices.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram illustrating an internal recycle anaerobic reactor.    Water distributing devices (1)    Gas collector (3)    Separator (4)    Central upright column (10)    Columnar tank body (12)