Boiler blow-off wastewater waste heat recovery system and recovery method

The invention provides a boiler blow-off waste water waste heat recovery system and method.The boiler blow-off waste water waste heat recovery system comprises a blow-off pond and a cooling pond, the blow-off pond is connected with an inlet pipe of a vacuum water diversion tank A, and an outlet pipe of the vacuum water diversion tank A is connected with a heat exchange waste water pump; the heat exchange wastewater pump is connected with a hot side inlet mother pipe of a heat exchanger, and a hot side outlet pipe of the heat exchanger is connected with a cooling pool; the cooling pool is connected with an inlet pipe of a vacuum water diversion tank B, and an outlet pipe of the vacuum water diversion tank B is connected with an inlet pipe of a water suction pump; a cold side inlet pipe of the heat exchanger is connected with a water outlet pipe of a make-up water pump, and a cold side outlet main pipe of the heat exchanger is connected with a boiler make-up pipe. Boiler blow-off wastewater cooling does not nee