NOVELTY - Organic solar cell based on carbon nano-tube fibers comprises carbon nano-tube fibers sensitized by N719 dye as working electrode materials, fluorine tin oxide (FTO) conductive glass or FTO-polyethylene naphthalate (PEN) conductive plastic as a substrate for working electrode and counter electrode, and lithium iodide, iodine, dimethyl-3-N-propyl-imidazolium iodide and anhydrous acetonitrile solution of butyl pyridine are as an electrolyte.    USE - Used as an organic solar cell based on carbon nano-tube fibers.    ADVANTAGE - The solar cell: has short-circuit light current of 10.3 mA/cm2; exceeds maximum monochromatic light-electricity conversion efficiency over 90% and energy conversion efficiency over 2.2%; comprises platinized FTO conductive plastic, and thus is flexible, bendable and an highly efficient photovoltaic apparatus.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for the preparation of the organic solar cell based on carbon nano-tube fibers comprising: (i) drawing carbon nano-tube fibers on the conductive surface of FTO conductive glass after spinning the carbon nano-tube fibers, soaking in a solvent to let the carbon nano-tube fibers contact with the FTO conductive glass well, placing a sample in a muffle to sinter at 345-355 degrees C for 0.4-0.6 hours, placing the sample in the acetonitrile solution of the N719 for 10-14 hours after it is cooled to 118-122 degrees C, taking out the sample, washing by absolute ethyl alcohol, drying by a nitrogen gun and using it as the working electrode of the cell; (ii) using platinized FTO conductive glass drilled with two pores as a counter electrode, hot-pressing the working electrode with the counter electrode at 98-102 degrees C by a thermoplastic plastic Surlyn (RTM: Commercial thermoplastic ionomer resin) with holes, filling the liquid electrolyte in the cell by the pores of the counter electrode, hot-pressing and sealing the pores at 98-102 degrees C by Surlyn (RTM: Commercial thermoplastic ionomer resin) plastic and glass sheet.