A new energy working-substance phase-change battery is disclosed, belonging to the technical field of batteries. The invention aims to provide a new energy working-substance phase-change battery capable of keeping power supply for a long time by combination of physical change and electrochemistry on the basis of environment protection. A heating pipe connected with a fuel generator is inserted in a closed heat collector; the heat collector is communicated with a condenser through a pipeline; the heat collector is communicated with a first battery and a second battery through a first battery exit pipe and a second battery exit pipe respectively; the first battery and the second battery are communicated with a liquid storage tank separately through a first battery liquid inlet pipe and a second battery liquid inlet pipe via a converging pipe; the liquid storage tank is communicated with the condenser; a first battery bi-directional electromagnetic valve and a second battery bi-directional electromagnetic valve are connected with a shared-time relay through circuits; and battery internal electrodes in the first battery and the second battery are connected with a power supply circuit. The new energy working-substance phase-change battery has the advantages of small volume, capability of reaching generation efficiency by using a small amount of fuel, low cost, no noise, simple structure and high power of generated electric energy.