NOVELTY - A sewage treatment system by biological fermentation method comprises fermenting kettle body (1) arranged horizontally, master body bracket (3) which rotatably supports two ends of kettle body, annular top sides (9) provided in two end faces of kettle body, connecting circular platform cylinders formed between annular top sides and two lateral end faces of kettle body, material feed hole (4) and material outlet (5) which are perforated in middle parts of annular top sides on two ends of kettle body, and material which is placed in kettle body.    USE - A sewage treatment system by biological fermentation method.    ADVANTAGE - The system realizes high activity of biological bacteria, has high reaction temperature, saves energy efficiently, has and sufficient fermentation of waste material, and avoids occurrence of secondary contamination by integrally collecting and disposing treated sludge.    DETAILED DESCRIPTION - A sewage treatment system by biological fermentation method comprises fermenting kettle body (1) arranged horizontally, master body bracket (3) which rotatably supports two ends of kettle body, annular top sides (9) provided in two end faces of kettle body, connecting circular platform cylinders formed between annular top sides and two lateral end faces of kettle body, material feed hole (4) and material outlet (5) which are perforated in middle parts of annular top sides on two ends of kettle body, and material which is placed in kettle body. The circular platform cylinder on one side is equipped with annular gear connected with driving mechanism. The material feed hole and material outlet are equipped with support rod used for fixing annular top sides on center axis which is supported on bearing seat fixed on master body bracket. The center axis is hollow through which sewage flows. The center axis is uniformly distributed by small water outlets.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of sewage treatment system by biological fermentation method.    Fermenting kettle body (1)    Master body bracket (3)    Material feed hole (4)    Material outlet (5)    Annular top sides (9)