The invention discloses a united coal-fired power station boiler smoke waste heat and moisture recycling system which comprises a smoke input pipeline, a high-temperature heat pipe type air pre-heater, a denitration reactor, a smoke bypass regulation baffle, an economizer, an air pre-heater, a smoke treatment system, a condensing heat exchanger, a chimney, a low-temperature heat pipe type air pre-heater, a cooling tower, a first air heater and a second air heater. The system can achieve united coal-fired power station boiler smoke waste heat and moisture recycling, and the problem that an arid area brown coal unit is large in water consumption, a coal pulverizing system is poor in drying capability and a coal mill is high in coal pulverizing power consumption can be effectively solved.