NOVELTY - A nanofiber composite film comprises core/shell structure of polyaniline aluminum oxide (Al2O3)-PANI nanofiber, resin, curing agent, flatting agent, dispersant, and organic solvent in which concentration ratio of resin solution:talcum powder:flatting agent:dispersant:nano-polyaniline fiber is 40-70:12-6:2-4:1-3:45-17 pts. wt.; core/shell structure of polyaniline Al2O3-PANI nanofiber is fibrous, grain size is 40-80 nm, length is 2-3 mu m, conductivity is 13 s/m, and purity is greater than or equal to 99.8%; and nano-polyaniline-fiber and xylene is mixed at ratio of 1:3.5-4.5 pts. wt.    USE - A nanofiber composite film for solar energy density absorbing film (claimed).    ADVANTAGE - Product has high absorption efficiency, wide frequency band, low transmission rate, light weight, low cost, less pollution, and simple technique.    DETAILED DESCRIPTION - A nanofiber composite film comprises core/shell structure of polyaniline aluminum oxide (Al2O3)-PANI nanofiber, resin, curing agent, flatting agent, dispersant, and organic solvent in which concentration ratio of resin solution:talcum powder:flatting agent:dispersant:nano-polyaniline fiber is 40-70:12-6:2-4:1-3:45-17 pts. wt.; core/shell structure of polyaniline Al2O3-PANI nanofiber is fibrous, grain size is 40-80 nm, length is 2-3 mu m, conductivity is 13 s/m, and purity is greater than or equal to 99.8%; nano-polyaniline-fiber and xylene is mixed at ratio of 1:3.5-4.5 pts. wt.; and organic solvent comprises xylene, cyclohexanone, and butanol with ratio of 17-13:5-2:0.5-2.5 pts. wt. INDEPENDENT CLAIMS are included for:    (1) preparation of nanofiber composite film which involves preparing binder: preparing organic solvent by mixing xylene, cyclohexanone, and butanol; preparing resin by uniformly mixing AC1100 polyurethane resin, fluorocarbon resin, acrylic resin, epoxy resin, and/or silicone resin, slowly adding to solvent mixture, heating while powerfully stirring at 60-80 degrees C for 30-60 minutes under reflux, high-speed dispersing polyaniline Al2O3-PANI nanofiber and xylene with concentration ratio of 1:3.5-4.5 pts. wt. for 20-30 minutes, oscillating using 5000 w ultrasonic wave oscillator for 90-110 minutes until completely dispersed, and setting aside binder; preparing component A by dissolving resin solution, pouring in ball milling pot, stirring at 800-1000 rpm for 10 minutes, opening water, adding talcum powder, 415 flatting agent, BYK104 dispersant, core/shell structure of polyaniline Al2O3-PANI nanofiber pulp, stirring with glass rod, milling at 1200 rph for 120 minutes until fineness is qualified, closing water, filtering with 120 meshes filter screen, removing from mill, sealing, and setting aside component A; preparing component B by mixing 6.5-7.5 pts. wt. TKA-9058B curing agent and 2.5-4.5 pts. wt. mixed organic solvent in ball milling pot at 800-1000 rpm for 10 minutes, stirring uniformly into transparent body, sealing, and setting aside component B; and    (2) spraying method which involves cleaning surface to be coated, pouring in component A and B with ratio of 100:6-15 in spray gun, evenly spraying on surface 1-5 times upto 50 mu m thickness, and drying at 60-80 degrees C for 60 minutes or naturally drying in which exposed free electron greatly varies and impacts performance of solar absorption; and resin is chosen depending on the requirements on different occasion.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow structure schematic diagram of nanofiber composite film preparation. (Drawing includes non-English language text).