Garden sewerage system and ditch flushing device thereof

The invention discloses a garden sewerage system. The garden sewerage system comprises a garden building and a garden ditch below the garden building and used for sewerage, the garden building is provided with a ditch flushing device, and the lower end of the ditch flushing device is located in a garden ditch. The invention further provides the ditch flushing device of the garden sewerage system. A water storage tank is located below s rainwater collecting tank, an inclined net plate is arranged at the upper end of the rainwater collecting tank, a plurality of strip grooves are formed in the net plate in a penetrating mode, the inner wall of the rainwater collecting tank is rotationally connected with a transverse rod, and a plurality of strip rods are fixedly connected to the transverse rod. The device is reasonable in structure, impurities such as leaves can be filtered through the net plate, the impurities are not prone to falling into the rainwater collecting tank, then the blocking situation is not prone