Method for reinforcing rainwater to inhibit water bloom formation of urban closed water body

The invention discloses a method for reinforcing rainwater to inhibit water bloom formation of an urban closed water body. An overflow groove is arranged along a side quay wall of the water body and at or above a normal water level, and rainwater and sewage overflow ports which are externally connected to rainwater and sewage overflow port connecting pipes are arranged in the overflow groove at every 5 to 25 meters; the rainwater and sewage overflow port connecting pipes are connected to a main sewage discharging horizontal pipe, and the main sewage discharging horizontal pipe is connected tothe upper part of a water level control tank; a submerged overflow pipe is arranged in the water level control tank and comprises a submerging section, a horizontal overflow section and a groove outlet flow section which are connected in sequence; alga water discharge ports which are connected to horizontal alga water discharge connecting pipes are arranged along the side quay wall of the water body, and each alga water d