NOVELTY - A graphene-phthalocyanine nanocomposite is prepared by mixing (g) carbon-carbon double bond modified graphite oxide (0.5-5), alkyl thioalcohol (1-5) and photosensitizer (0.01-0.25), stirring for 10-30 minutes under UV light, cooling, filtering, washing separated solids with organic solvent, vacuum drying at low temperature to obtain graphite oxide-phthalocyanine nanocomposite, slowly adding strong reducing agent (0.5-5 ml) to the prepared composite (1-2.5 g), stirring at 60-80 degrees C for 6-48 hours, subjecting to centrifuge, filtering, and vacuum drying separated solids at low temperature.    USE - Method of preparing a graphene-phthalocyanine nanocomposite (claimed) for use as electricity conductive material for solar battery material or photoelectric conversion material.    ADVANTAGE - The method does not produce pollutants; is simple and low cost; does not have catalyst accession; and prepares product having good dissolution rate, high photosensitivity, good compatibility and heat stability, and excellent membrane formation capability and photoelectricity capability.    DETAILED DESCRIPTION - A graphene-phthalocyanine nanocomposite is prepared by:    (A) cooling concentrated 98% sulfuric acid (10-100 ml) in ice-water bath controlled at 0-5 degrees C, adding (g) flaky graphite (0.5-5) and sodium nitrate (0.25-2.5), stirring, adding potassium permanganate (1-15 g), removing from ice-water bath, stirring for 12-72 hours, adding deionized water (20-200 ml), heating at 60-100 degrees C for 0.5-12 hours, cooling to 30-60 degrees C, adding 30% hydrogen peroxide solution (10-100 ml), stirring for 15-90 minutes, subjecting to centrifuge, filtering, washing separated solids with water, contacting with ion exchange resin, and vacuum drying at low temperature to obtain graphite oxide powder;    (B) dispersing obtained powder (0.5-5 g) in alcohol, subjecting to water bath controlled at 20-55 degrees C, adding mixture (5-50 ml) of alcohol and coupling agent having a concentration of 0.05-0.25 g/ml, stirring for 10-96 hours, subjecting to centrifuge, filtering, washing separated solids with water, and drying at 40 degrees C for more than 12 hours to obtain carbon-carbon double bond modified graphite oxide powder;    (C) mixing (g) hydrosulfonyl substituted phthalonitrile monomer (0.1-5), anhydrous metal salts (0.01-0.5) and ammonium molybdate (balance) in the presence of nitrogen, adding high b. pt. organic solvent (50-150 ml), stirring at 180-220 degrees C for 6-24 hours, filtering while hot, washing separated solids with carbinol, and vacuum drying at low temperature to obtain alkyl mercaptan substituted phthalocyanine;    (D) mixing (g) carbon-carbon double bond modified graphite oxide (0.5-5), alkyl thioalcohol (1-5) and photosensitizer (0.01-0.25), stirring for 10-30 minutes under UV light, cooling, filtering, washing separated solids with organic solvent, and vacuum drying at low temperature to obtain graphite oxide-phthalocyanine nanocomposite; and    (E) slowly adding strong reducing agent (0.5-5 ml) to the prepared composite (1-2.5 g), stirring at 60-80 degrees C for 6-48 hours, subjecting to centrifuge, filtering, and vacuum drying separated solids at low temperature.