Domestic wastewater automatic flushing system for water closet

The utility model relates to a domestic wastewater automatic flushing system for a water closet. The automatic flushing system comprises a power cylinder, including an upper cylinder cover with a button thereon. The upper cylinder cover is connected to a water inlet pipe and a water outlet pipe which is equipped with an upper spraying nozzle thereon. An upper cylinder is arranged under the upper cylinder cover, and a lower cylinder is arranged under the upper cylinder. The upper cylinder and the lower cylinder share an intermediate cover and have an upper piston and a lower piston therein respectively. The upper piston and the lower piston are connected through a link rod. A first water inlet pipe and a second water inlet pipe are led out by the water inlet pipe, and a first water outlet pipe and a second water outlet pipe are led out by the water outlet pipe. The intermediate cover is communicated with the second water inlet pipe and the second water outlet pipe through the upper cylinder cover. A base is co