Lift type underground ring main unit based automatic water drainage system

The invention discloses a lift type underground ring main unit based automatic water drainage system. The lift type underground ring main unit based automatic water drainage system comprises a lift type underground ring main unit integral structure, a water accumulating pond, a submersible pump, a middle controller, a first liquid level meter, a second liquid level meter, a third liquid level meter, a water drainage tube, a non-return valve, an audible and visual alarm, an automatic dialing device, a standby power supply, a photographic device, a client side and a foundation pit, wherein whileaccumulated water reaches the position of the second liquid level meter, a signal is transmitted to the middle controller to control the submersible pump to start, and water is extracted and discharged into an urban drainage pipeline through the submersible pump; while accumulated water reduces to the position of the first liquid level meter, the submersible pump stops work, and the non-return valve is closed; if water level rises to the second liquid level meter, the submersible pump is not started, and water level in the water accumulating pond continuously rises; while water level reachesthe third liquid level meter, the signal is transmitted to the middle controller for controlling the audible and visual alarm by the third liquid level meter, and the automatic dialing device is started for transmitting the signal to the client side, so that hidden danger of a safety accident is avoided.