Heat pump steam system water supplementing method and heat pump steam water supplementing system

According to the heat pump steam system water supplementing method and the heat pump steam water supplementing system, the water supplementing temperature is controlled, the basic water temperature of water supplementing of a flash tank is increased, a heat pump steam unit is made to be in the better operation working condition, the stability of the steam production process is guaranteed, the purity of tail end steam supply is guaranteed, and the energy consumption of the heat pump steam system is reduced. Comprising a flash tank, a heat pump steam unit and a water replenishing tank, and when the real-time water level L in the water replenishing tank is smaller than or equal to Lmin and the real-time water temperature T1 in the water replenishing tank is larger than or equal to T2, water in the water replenishing tank is directly conveyed to the head end of a water return pipeline of the flash tank through a water replenishing pipeline for water replenishing; when the real-time water level L in the water repl