The invention provides a community sewage treatment system which includes a sewage treatment tank, a water reservoir, a sprinkling device and a server. The sewage treatment tank includes a water quality monitoring chip, a liquid level controller, an auto-drug-adding apparatus and a drainage apparatus, which are respectively connected to a first main control board. The first main control board is integrated with a first communication unit. The sprinkling device includes a sunlight sensor, a temperature and humidity sensor and a nozzle, which are respectively connected to a second main control board. The second main control board is integrated with a second communication unit. After sewage is treated in the sewage treatment tank, treated water is sprinkled on road surface or is used for watering plants in a community by means of the sprinkling device arranged on the ground. In the system, the sewage is treated in the sewage treatment tank arranged indoor, so that secondary utilization of the sewage is achieved, and emission load of the sewage is reduced and community environment is protected.