NOVELTY - Preparing nano-ordered porous organic film based on polythiophene-fullerene-poly(lactic acid) triblock copolymer comprises e.g. preparing aldehyde-modified polythiophene by using polythiophene, anhydrous toluene, N-methylformanilide and phosphorus oxychloride, then preparing fullerene-capped polythiophene from aldehyde-modified polythiophene, reacting fullerene-capped polythiophene with p-hydroxybenzaldehyde and creatinine, then reacting obtained product with D- or L-lactide and stannous octoate, and preparing obtained polythiophene-fullerene-poly(lactic acid) triblock copolymer into a film.    USE - The porous organic film is useful for conductive material, solar cell material, photo conductive material and photoelectric conversion material.    ADVANTAGE - The method: is simple and economical; has high input output ratio; produces product, which has evenly spaced micro-phase separation structure with inter-phase scale of 35 nm; and ensures high specific surface area, photoinduced charge transfer phenomena, good compatibility, thermal stability and solubility, and good film forming performance and photovoltaic performance.    DETAILED DESCRIPTION - Preparing nano-ordered porous organic film based on polythiophene-fullerene-poly(lactic acid) triblock copolymer comprises (i) adding the substituted polythiophene (100-1000 mg) and anhydrous toluene (5-50 ml) into a reaction flask under nitrogen atmosphere, stirring with a magnetic stirrer and slowly heating at 60-120 degrees C until substituted polythiophene completely dissolved, adding N-methylformanilide (0.1- 5 ml) and phosphorus oxychloride (0.1-2 ml), stirring, allowing to react at 50-90 degrees C for 4-36 hours under nitrogen atmosphere, then cooling at 25 degrees C, then dropwise adding saturated sodium acetate solution (1-20 ml), continuously stirring for 0.5-5 hours, pouring obtained reaction mixture into a separating funnel, allowing to stand for layering, extracting the upper oil phase, precipitating and separating by using absolute ethanol (50-250 ml), and vacuum drying obtained product at 30-80 degrees C for 6-48 hours to obtain an aldehyde-modified polythiophene with a yield of 70-95%, (ii) adding the aldehyde-modified polythiophene (10-100 mg), sarcosine (10-100 mg), fullerene (10-100 mg) and toluene (5-50 ml) into a reaction flask under nitrogen atmosphere, stirring at 30-90 degrees C until aldehyde-modified polythiophene is completely dissolved, heating at 50-150 degrees C, stirring to react for 6-36 hours, cooling at 25 degrees C, precipitating and separating by using methanol (10-100 ml), extracting the precipitate of the product with hexane by using Soxhlet extraction for 6-96 hours to remove excess of fullerene, and then vacuum drying obtained product at 30-80 degrees C for 6-48 hours to obtain fullerene-capped polythiophene with an average molecular weight of 5000-15000 and yield of 80-96%, (iii) adding obtained fullerene-capped polythiophene (10-100 mg), p-hydroxybenzaldehyde (5-50 mg), creatinine (15-100 mg) and toluene (5-100 ml) into a reaction flask under nitrogen atmosphere, stirring to react at 60-150 degrees C for 6-96 hours, precipitating by using methanol (10-80 ml), separating by centrifuging with 1000-8000 rotations/minute, vacuum drying obtained product at 30-80 degrees C for 6-48 hours to obtain fullerene-capped polythiophene containing hydroxy group (25-200 mg), then adding the fullerene-capped polythiophene containing hydroxy group (10-100 mg), D- or L-lactide (10-150 mg), stannous octoate (1-15 mg), toluene (5-50 ml) into a reaction flask (50-250 ml) under nitrogen atmosphere, stirring at 50-150 degrees C for 6-96 hours, cooling to 25 degrees C, precipitating using methanol (10-100 ml), and vacuum drying obtained product at 30-80 degrees C for 6-48 to obtain polythiophene-fullerene-poly(lactic acid) triblock copolymer with average molecular weight of 8000-20000 and yield of 40-70%, where weight ratio of polythiophene to fullerene is (1-5):1, and weight ratio of polythiophene to poly(lactic acid) is (5-10):1; and (iv) dissolving the polythiophene-fullerene-poly(lactic acid) triblock copolymer in 1,2-dichlorobenzene (1-15 ml) with a concentration of 0.5-50 mg/ml to obtain polythiophene-fullerene-poly(lactic acid) triblock copolymer solution, coating the triblock copolymer solution on an electric conductive matrix by a spin coating method to obtain a polymer wet film, where the spin coating speed is 200-2000 rotations/minute, transferring the polymer wet film into a petridish, slowly evaporating at 25-50 degrees C for 0.5-4 hours, transferring the dried film into an inert atmosphere and annealing at 120-180 degrees C for 0.5-6 hours, etching the poly(lactic acid) chains under room temperature for 8-96 hours by using water-methanol solution containing sodium hydroxide (0.1-2 mol/l), then washing obtained film with deionized water for several times, and drying with compressed air.