Rainwater and sewage diversion transformation structure for combined community

The utility model discloses a rainwater and sewage diversion transformation structure for a combined community. The system comprises a current/new sewage vertical pipe, a current/new rainwater vertical pipe, a novel unpowered regulation and storage septic tank and a catch basin, the current/newly-built sewage vertical pipe, the novel unpowered regulation and storage septic tank and the community drainage inspection well are connected in sequence; the rainfall control unpowered automatic opening and closing valve is mounted on a water outlet pipe of the septic tank; the rainfall control unpowered automatic opening and closing valve comprises a valve body, a water tank, a supporting spring, small outflow holes and a flashboard. The water tank is positioned above the valve body; the supporting spring is arranged between the water tank and the valve body; the flashboard is mounted at the lower end of the water tank and extends into the valve body from the upper end; the flashboard is movably connected with the va