Automatic drainage and sludge discharge device

The utility model relates to an automatic water and sludge discharging device which comprises a first sludge discharging mechanism and a second sludge discharging mechanism, and further comprises a sludge feeding bin, a gas-water separator, a vacuum pump, a compressed air tank, a water suction well, a water bin and a plurality of high-pressure water discharging pumps, a mud-water mixture inlet ofthe compressed air tank is connected with an outlet of the mud suction pipeline through a fourth pipeline, an inlet of the mud suction pipeline extends into a mud-water mixture of the water sump, thewater sump is communicated with the water suction well, a mud-water mixture outlet of the compressed air tank is connected with a fifth pipeline, and the end, away from the compressed air tank, of thefifth pipeline extends into the mud feeding bin. A third pipeline used for being connected with a compressed air inlet pipe is arranged on the compressed air tank, and sludge inlets of the first sludge discharging mechanism an