Thermoelectric boiler drainage heat recovery system

The utility model provides a boiler drain heat recovery system which comprises a drain recoverer, a drain flash tank and a drain tank, and the drain recoverer is provided with a first water inlet pipe, a water outlet pipe and a steam outlet pipe; the drain flash tank is connected with a water outlet pipe of the drain recoverer; the drain tank is connected with the drain recoverer; and the drain tank is provided with a first reuse water pipe connected with the denitration system and a second reuse water pipe connected with the deaerator. According to the boiler drain water heat recovery system, the drain water recoverer can receive high-pressure drain water and low-pressure drain water of the primary air pre-heater, steam is supplied into the air conditioning unit through the steam outlet pipe at the top, heat in the steam is fully recycled, hot water in the drain water recoverer is conveyed to the drain water flash tank, and the heat of the steam is recycled. And hot water is supplied to the denitration syste