NOVELTY - A driving bed biomembrane reaction device comprises horizontal first reactor located above a second reactor. The two reactors are connected in series. The reactors comprise a columnar reaction barrel (1) and a rotary impeller (2) supported in the reaction barrel, where upper part of the reaction barrel is set with a water inlet (3) tangentially, and upper part of one end is set with a fan-shaped water outlet (4). A cross-section of the rotary impeller is in radial shape, which is composed of a hollow shaft having a sealed end.    USE - Driving bed biomembrane reaction device for sewage treatment.    ADVANTAGE - The device can prolong flow of sewage contacting with the biomembrane, thus evidently improving treatment effect of sewage.    DETAILED DESCRIPTION - A driving bed biomembrane reaction device comprises horizontal first reactor located above a second reactor. The two reactors are connected in series. The reactors comprise a columnar reaction barrel (1) and a rotary impeller (2) supported in the reaction barrel, where upper part of the reaction barrel is set with a water inlet (3) tangentially, and upper part of one end is set with a fan-shaped water outlet (4). A cross-section of the rotary impeller is in radial shape, which is composed of a hollow shaft having a sealed end and having a surface on which air holes are distributed and blades welded on two surfaces of the hollow shaft and attached with biomembranes. The adjacent two blades on the rotary impeller and internal wall of the reaction barrel are surrounded into sealed space. The device comprises two air compression devices, each having a piston air pump and a crank handle. The device further comprises a tank body (5), which is a hexahedron for sealing the two reactors, where upper and lower parts are set with a water inlet (9) and a water outlet (11), and interior is set with a uniform flow zone (8), a first water collection zone (6), a second water collection zone (7) and a confluence zone (10) in series from upper part to lower part.    DESCRIPTION OF DRAWING(S) - The drawing is a perspective view of a driving bed biomembrane reaction device.    Columnar reaction barrel (1)    Rotary impeller (2)    Water inlet (3)    Fan-shaped water outlet (4)    Tank body (5)    Collection zone (6)    Second water collection zone (7)    Uniform flow zone (8)    Water inlet (9)    Water outlet (11)