The invention discloses an air-source low-temperature tri-generation 
heat pump hot water unit and an implementation method thereof, and solves the problems that functions of a 
heat pump unit are single and demands are difficult to meet. The air-source low-temperature tri-generation 
heat pump hot water unit comprises a compressor, an 
economizer, a separator, a three-way valve, a hot 
water processing device, a four-way valve, an 
evaporator, a second condenser, a 
circulating pump, an annular one-way valve group, a 
liquid storage tank and a fan, wherein a liquid spray port is formed in the compressor; the 
economizer is connected with the liquid spray port of the compressor; an output end of the separator is connected with an input end of the compressor; the three-way valve is connected with an output end of the compressor; the hot 
water processing device is connected with the three-way valve; the four-way valve is connected on a pipeline between the three-way valve and the hot 
water processing device; the 
evaporator and the second condenser are connected with the four-way valve respectively; the 
circulating pump and the annular one-way valve group are connected with the second condenser respectively; the 
liquid storage tank is connected with the annular one-way valve group and the 
economizer respectively; the fan corresponds to the 
evaporator; the separator is connected with the four-way valve; the evaporator and the economizer are connected with the annular one-way valve group respectively; and an 
electromagnetic valve is further arranged between the 
liquid storage tank and the economizer. The air-source low-temperature tri-generation heat pump hot water unit is reasonable in structure, multifunctional, convenient to use and suitable for promotion.