The utility model discloses a nanometer phase change energy storage formula boiler, including fused salt device, molten salt circulating pump, fused salt heating device and heat transfer device, the fused salt device is connected with fused salt heating device through the molten salt circulating pump, and heat transfer device is connected with fused salt heating device and fused salt device respectively, and heat transfer device is equipped with hot water import and hot water export. The utility model discloses heat exchange coefficient is high, and the heat transfer volume is big, but automated control, and utilize power consumption low time heat -retaining design, with heating, heat -retaining, get heat, heat transfer and control function and put together, reach higher heat transfer volume through the phase transition heat transfer.