NOVELTY - Nano-molten salt phase change energy storage solar boiler comprises a Fresnel light-collecting device (1) supported by multiple supporting rods (4), a phase change energy storage heat exchanger (2) placed in V-shaped balance support (5) and carried on the bottom support, and a double-shaft tracker (3). The V-shaped balance support is installed on weft insertion shaft of the double-shaft tracker. The phase change energy storage heat exchanger is placed on the converging focal point of the Fresnel light-collecting device. The shaft of the double-shaft tracker is connected to solar boiler base.    USE - Used as a nano-molten salt phase change energy storage solar boiler.    ADVANTAGE - The boiler meets the general family life thermal requirements of hot water, cooking and barbecue, has high heat-collecting temperature, and operates without open air and can be conveniently used during night.    DETAILED DESCRIPTION - Nano-molten salt phase change energy storage solar boiler comprises a Fresnel light-collecting device (1), a phase change energy storage heat exchanger (2), a double-shaft tracker (3), a supporting rod (4), a V-shaped balance support (5) and bottom support. The Fresnel light-collecting device is supported by multiple supporting rods. The other end of the supporting rod is installed on the V-shaped balance support. The V-shaped balance support is installed on weft insertion shaft of the double-shaft tracker. One end of the phase change energy storage heat exchanger is placed in the V-shaped balance support and carried on the bottom support, and the other end on the converging focal point of the Fresnel light-collecting device. The shaft of the double-shaft tracker is connected with the base of the solar boiler.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the nano-molten salt phase change energy storage solar boiler.    Fresnel light-collecting device (1)    Phase change energy storage heat exchanger (2)    Double-shaft tracker (3)    Supporting rod (4)    V-shaped balance support (5)