NOVELTY - Preparation of solar energy battery microporous indium tin oxide (ITO) nanomaterial includes mixing indium precursor, tin precursor, surfactant and organic binder in a solvent, adjusting metal ion concentration, placing the mixture into high-pressure reaction kettle with lining, adding supercritical fluid into the high pressure reaction kettle, maintaining a pressure of 7-17 MPa, uniformly mixing, adding the uniformly mixed material into feeding screw, gradually pressing into homogeneous body, filtering, removing impurities, accurately controlling fiber fineness and uniformity and extruding.    USE - Preparation of solar energy battery microporous ITO nanomaterial.    ADVANTAGE - By optimizing the microporous structure and chain orientation, the method provides solar energy battery microporous ITO nanomaterial with good performance. The solar energy battery microporous ITO nanomaterial satisfies wide spectrum light military camouflage hiding requirements.    DETAILED DESCRIPTION - Preparation of solar energy battery microporous ITO nanomaterial comprises uniformly mixing indium precursor, tin precursor, surfactant and organic binder in a solvent, where ratio of indium and tin ions is 90:10-80:20, adjusting metal ion concentration at 0.6-0.7 M, placing the mixture into high-pressure reaction kettle with lining, where amount of surfactant is 0.1-1 wt.% and amount of organic binder is 1-5 wt.%, adding supercritical fluid into the high pressure reaction kettle, maintaining a pressure of 7-17 MPa, uniformly mixing at 50-380 degrees C for 20-28 hours, adding the uniformly mixed material into feeding screw, gradually pressing into homogeneous body, filtering, removing impurities, accurately controlling fiber fineness and uniformity, extruding, hot air flowing, cooling, curing, forming superfine microporous fiber, naturally cooling, placing in an oven, heating at 95-105 degrees C, high temperature calcining at 600-1000 degrees C for 5-25 hours, cooling to room temperature, and obtaining pale yellow microporous ITO nanofiber.