The invention belongs to the technical field of new energy sources, and specifically relates to a high-temperature stable fibriform lithium air battery and a preparation method thereof. A traditional lithium air battery is restricted by inflammable, explosive and volatile characteristics of an organic electrolyte, the traditional lithium air battery is always unbearable for relatively high temperature in actual using process, and the liquid condition of the electrolyte also has a leakage pollution risk frequently, so that the application of the battery as a flexible fibriform wearable energy source device is restricted. However, ionic liquid has relatively low vapor pressure, relatively wide electrochemical window and excellent stability, so that the fibriform lithium air battery has excellent application prospect. Based on the ionic liquid and a macromolecule skeleton material, a solid polymer electrode capable of resisting high temperature is prepared, and the solid polymer electrode is combined with an orientation carbon nano tube thin film and lithium metal, so that the high-temperature stable fibriform lithium air battery is constructed. The battery can operate stably at the temperature reaching up to 140 DEG C, more than 380 cycles of charge and discharge can be cycled under high current of 10 A g<-1>, and the battery has relatively large application prospect in the field of high-temperature-resistant fabric.