NOVELTY - A polythiophene-carbon nanotube composite photosensitive film material is prepared by dispersing an organic amine or organic alcohol modified carbon nanotube (50-500 mg) in an organic solvent, dissolving polythiophene derivative (50-500 mg) in the organic solvent, dripping polythiophene derivative into the carbon nanotube solution, and coating the composite material solution of polythiophene derivative and carbon nanotube solution on an electroconductive substrate at 2-10 mm/second.    USE - Method for preparing a polythiophene-carbon nanotube composite photosensitive film material (claimed) for electroconductive material, solar battery material, photoelectroconductive material, and photoelectric conversion material.    ADVANTAGE - The composite film material has higher photosensitivity, compatibility and thermal stability, and good solubility property, film-forming property, and photoelectric property. Storage stability of the nanocomposite photosensitive film material and dispersion evenness of the carbon nanotube in the polythiophene are far better than traditional physical methods. The preparation has high coating quality, high input-output ratio, and low cost. The product is a new type environment friendly chemical product.    DETAILED DESCRIPTION - Preparation of polythiophene-carbon nanotube composite photosensitive film material involves adding multiwall carbon nanotube (100-1000 g) to strong acid mixture solution including concentrated sulfuric acid (150 ml) and concentrated nitric acid with volume ratio of 3:0.8-3:1.2, ultrasonically oscillating for 3-12 hours, pouring into de-ionized water, placing more than 12 hours, filtering and water-washing to neutral, baking and obtaining carbon nanotube with carboxyl. Under the protection of nitrogen, the carbon nanotube with carboxyl (80-800 mg) is placed to excess thionyl chloride for reflux 12-72 hours. Pressure is reduced to distill to remove residual thionyl chloride. Vacuum-drying is conducted to obtain acyl-chloridized carbon nanotube. The acyl-chloridized carbon nanotube (50-500 mg) is dispersed in the anhydrous acetone. Fresh pyridine or triethylamine is added. Acetone solution (5-20 ml) of organic amine or organic alcohol is dispersed not less than 30 minutes, with concentration of 0.005-0.025 g/ml, at 58-65 degrees C. Continuous reaction is done for 4-75 hours. Washing is conducted to remove excess organic amine or organic alcohol with acetone. Filtering and vacuum-drying obtains carbon nanotube modified by organic amine or organic alcohol. Under the protection of nitrogen, anhydrous ferric chloride (0.05-5 g) and chloroform (5-50 ml) are added to a flask and stirred for 5-90 minutes at room temperature, obtaining dark green dirty solution. Alkyl-substituted thiophene (0.5-5 g) or chloroform solution (5-50 ml) of alkyl-substituted thiophene monomer is dripped and stirred for 4-72 hours at room temperature. The mixture is poured into methanol (50-1000 ml) for sedimentation, filtering. The residual solid is immerged in the strong ammonia water. Washing is done with de-ionized water. Drying is conducted in the vacuum oven. The product is dissolved with chloroform (10-100 ml), and filtered to remove insoluble part. Methanol (100-500 ml) is used for filtrate sedimentation. The obtained solid is washed with methanol. The process of dissolving with chloroform and sedimenting with methanol is repeated more than 3 times. Impurities are removed to obtain polythiophene derivative. The organic amine or organic alcohol modified carbon nanotube (50-500 mg) is dispersed in the organic solvent, with concentration of carbon nanotube of 0.5-10 mg/ml. Polythiophene derivative (50-500 mg) is dissolved in the organic solvent, with concentration of polythiophene derivative of 0.5-10 mg/ml and stirred. Polythiophene derivative is dripped into the carbon nanotube solution, with weight ration between carbon nanotube and polythiophene derivative of 1:1-20, and stirred for 1-12 hours at room temperature. The composite material solution of polythiophene derivative and carbon nanotube solution is coated on the electroconductive substrate at 2-10 mm/second, with coated solution viscosity of 100-500 cp. The coating is dried for 0.5-6 hours at 35-120 degrees C. The dried coat is 15-45 mu m thick.