NOVELTY - Preparing indium-tin-oxide (ITO) micro fiber, comprises mixing an indium precursor, a tin precursor, a surface active agent, a organic bonding agent and a sol-gel stable auxiliary agent in a solvent, uniformly stirring obtained product to obtain mixture in a reaction kettle with an internal lining, adding supercritical fluid to the blend, filtering impurity and residual polymerization catalyst, placing the obtained product into a flowing section and expanding section for extruding, and solidifying, naturally cooling, heating and drying to obtain indium(III) oxide and tin dioxide, and cooling.    USE - The ITO micro fiber is useful in a plane display, a solar battery, a sensor, a functional glass and a military camouflage.    DETAILED DESCRIPTION - Preparing indium-tin-oxide (ITO) micro fiber, comprises mixing an indium precursor, a tin precursor, a surface active agent, a organic bonding agent and a sol-gel stable auxiliary agent in a solvent, where the indium precursor and the tin precursor have a mass ratio of 90:10-80:20, and the metal ion concentration is adjusted between 0.6-0.7 M, uniformly stirring obtained product to obtain mixture in a reaction kettle with an internal lining, where the addition of the surface active agent is 1/1000-1/100, the organic bonding agent is 5/1000-5/100 and the sol-gel stable auxiliary agent is 1/1000-5/1000, adding supercritical fluid to the above blend into an autoclave at a pressure of 7-17 MPa for 20-28 hours and then stirring at 50-380 degrees C, adding the mixture into a screw feeding section and then uniformly mixing, filtering impurity and residual polymerization catalyst using a filter connected in a filtering medium, adding the filtrate into a metering pump connected with a gear metering pump inlet to precisely control the fiber fineness and uniformity, placing the obtained product into a flowing section and expanding section for extruding at an ambient pressure, placing the obtained product into a flowing section and expanding section for extruding at an ambient pressure, and solidifying, naturally cooling, heating and drying obtained product at a 95-105 degrees C and a high temperature of 600-1000 degrees C for 5-25 hours to obtain indium(III) oxide and tin dioxide, and cooling at a room temperature in a furnace.