Safe and energy-saving heat pump water boiler system

The invention discloses a safe and energy-saving heat pump water boiler system which comprises a first system and a second system, an intermediate heat exchanger is arranged between the first system and the second system, an inlet F1 and an inlet F3 and an outlet F2 and an outlet F4 are formed in the intermediate heat exchanger respectively, the F1 is connected with the F2, the F3 is connected with the F4, and heat preservation boxes are arranged outside the first system and the second system. A water level controller is arranged in the heat preservation box, it is guaranteed that the heat preservation box is in a full-water state during operation, a safety pressure relief valve is installed outside the heat preservation box, if the internal pressure exceeds the set pressure, the safety pressure relief valve can automatically relieve pressure, and it is guaranteed that the internal pressure of the heat preservation box is within the safety range. According to the safe and energy-saving heat pump water boiler