NOVELTY - Domestic sewage treating tank, comprises horizontal drum-shaped main body (1) with its two end faces comprising water inlet (2) and water outlet (3). An inner cavity of main body is divided into 5 independent spaces by multiple baffles arranged vertically. The water inlet communicates with first space which communicates with second space via multiple flow guide holes at upper end of baffle. The second and third spaces are filled with filling materials (4) for biochemical treatment. The fourth space comprises a filtering material (5), and water outlet communicates with fifth space.    USE - Used as a domestic sewage treating tank.    ADVANTAGE - The tank provides an unpowered sewage treatment with good treatment effect at low cost and can be installed integrally and movably.    DETAILED DESCRIPTION - Domestic sewage treating tank, comprises an horizontal drum-shaped main body (1) with the two end faces of the main body separately comprising a water inlet (2) and a water outlet (3). An inner cavity of the main body is divided into five independent spaces by multiple baffles arranged vertically. The water inlet communicates with the first space which communicates with the second space via multiple flow guide holes at the upper end of the baffle. The second space communicates with the third space via a gap at the lower end of the baffle, and the second space and the third space are filled with filling materials (4) for biochemical treatment. The third space communicates with the fourth space via multiple flow guide holes at the upper end of the baffle. The fourth space communicates with the fifth space via multiple flow guide holes at the lower end of the baffle, and a filtering material (5) is arranged in the fourth space. The water outlet communicates with the fifth space.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram of the domestic sewage treating tank.    Drum-shaped main body (1)    Water inlet (2)    Water outlet (3)    Filling materials (4)    Filtering material (5)