Kitchen sewer water supply and drainage equipment

The utility model discloses water supply and drainage equipment for a kitchen sewer. The device structurally comprises a base, the device comprises a cover plate, a water tank, a filtering inner core,an outer core and a water return preventing device, the cover plate is in the shape of a circular plate with a hole and is clamped above the bowl-shaped water tank; the filtering inner core is movably clamped in the cylindrical tubular outer core; the outer core is fixed below the water tank; the water return preventer is fixed below the outer core and is communicated with the outer core and thewater tank; the water return preventing device is mainly composed of a shell, a rotating shaft, a baffle, a weight increasing block and a water blocking ring. The shell is in a cuboid and cylinder combined shape. The baffle is matched with the cross section of the shell, is fixed on the rotating shaft and is in contact with the interior of the shell; the weight increasing block is arranged at therear end of the baffle; acc