Automatic siphon drainage system

The utility model provides an automatic siphon drainage system. The automatic siphon drainage system comprises a water pump connected with an upper water pipe and a water charging pipe, an automatic air exhaust valve installed on an exhaust pipe, a sluice valve connected with siphons in series, an electric butterfly valve connected with the siphons in series, an electric butterfly valve connected with drainage pipes in series, an electric butterfly valve connected with the water charging pipe and one of the siphons or one of the drainage pipes in series, a water level sensor installed in a water collection pool and a pressure sensor installed on the water charging pipe. When the water level value reaches a preset threshold value, triggering signals are sent to the electric butterfly valves and the water pump; when the pressure value is larger than a preset threshold value, the pressure sensor installed on the water charging pipe sends triggering signals to the electric butterfly valves and the water pump. According to the automatic siphon drainage system, through the water charging of the water pump, the air exhaust of the automatic air exhaust valve and the opening and the closing of the electric butterfly valves, the siphonic effect is generated to drain water automatically, the water level and the water drainage volume can also be controlled, the automation and urgent water drainage can be considered at the same time, and the energy conservation and the practicability can be achieved.