NOVELTY - A wastewater processing system comprises a water collecting well (1), which is connected with water inlet of a regulating tank (2) via pipeline, and a lifting pump (13). Water outlet of adjusting tank is connected with the inlet of the first measuring tank (6-1) via a pipeline and a water pump (14). An outlet of first measuring tank is connected with inlet of first aeration tank (3-1). An outlet of first aeration tank is connected with inlet of second aeration tank (3-2). An outlet tube of a reflow pump (15) is connected with reflow water inlet tube of the regulating tank.    USE - System for processing percolation liquid wastewater (claimed).    ADVANTAGE - The yielded water achieves the national first level of discharging standard or discharging standard of relative industries.    DETAILED DESCRIPTION - A wastewater processing system comprises a water collecting well (1), which is connected with water inlet of a regulating tank (2) via pipeline, and a lifting pump (13). Water outlet of adjusting tank is connected with the inlet of the first measuring tank (6-1) via a pipeline and a water pump (14). An outlet of first measuring tank is connected with inlet of first aeration tank (3-1). An outlet of first aeration tank is connected with inlet of second aeration tank (3-2). An outlet of second aeration tank is connected with a water inlet of a precipitation tank (4) via pipeline. An outlet tube of a reflow pump (15) in the second aeration tank is connected with reflow water inlet tube of the regulating tank via a second measuring tank (6-2). The outlet of precipitation tank is connected with inlet of a yielding water processing tank (5) via pipeline. The outlet of yielding water processing tank is connected with a standard discharging tube, which is connected with sewer, where the regulating tank and the first and second aeration tanks are respectively connected with a blower. The first aeration tank is provided with activating agent device (9). The water collecting well is provided with bar screen (7). An INDEPENDENT CLAIM is included for processing method for percolation liquid by continuously aerating wastewater in the regulating tank via the pre-aeration system, where the strength of aeration is 1-2 m3/100 m3 (water)asteriskminute; carrying out biotreatment; and treating wastewater by activating agent device. The biotreated wastewater is precipitated above 1 hour in vertical flow precipitation tank, where mud and water are separated, and the bottom mud is discharged. Supernatant liquid flows in the yielding water processing tank. Part of qualified water in the yielding water processing tank reflows to the regulating tank, and the rest are discharged.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of processing system for percolation liquid wastewater (Drawing includes non-English language text).    Water collecting well (1)    Regulating tank (2)    First aeration tank (3-1)    Second aeration tank (3-2)    Precipitation tank (4)    Yielding water processing tank (5)    First measuring tank (6-1)    Second measuring tank (6-2)    Bar screen (7)    Lifting pump (13)    Water pump (14)    Reflow pump (15)