A functional copper sulfide composition comprising a copper salt, a metal salt, a reducing agent, a sulfur compound, a catalyst, a polyamine, an alkali compound and a pH adjusting agent, characterized in that the copper salt is one or more selected from the group consisting of cupric sulfate salt, cupric chloride salt, cupric nitrate salt, cupric acetate salt and cupric sulfate ammonium salt; the metal salt is an inorganic acid salt or an organic acid salt of a metal selected from the group consisting of gold, silver, platinum, nickel, manganese, cobalt, chromium, zinc, palladium, rhodium, ruthenium, osmium, magnesium, iron and iridium; the reducing agent is one or more selected from the group consisting of metal copper, hydroxylamine, ferrous sulfate, ammonium vanadate, furfural, sodium hypophosphate, sodium hypophosphite, sodium hydrogen sulfite, glucose and phenyl compounds; the sulfur compound is one or more selected from sodium sulfide, sulfur dioxide, sulfurous acid, sodium sulfite, sodium hydrogen sulfite, sodium pyrosulfite, hyposulfurous acid, sodium hydrosulfite, sodium thiosulfate, potassium thiosulfate, ammonium thiosulfate, thiourea dioxide, hydrogen sulfide, formaldehyde sodium sulfoxylate; the catalyst is one or more selected from the group consisting of magnesium chloride, potassium chloride, calcium chloride, zinc acetate, ammonium chloride, ammonium sulfate, ammonium carbonate and ammonium nitrate; the polyamine is one or more selected from the group consisting of methylene diamine, ethylene diamine, trimethylene diamine, tetramethylene diamine, pentamethylene diamine, hexamethylenediamine, heptamethylenediamine, diethylene triamine, triethylene tetramine, tetraethylene pentamine and pentaethylene hexamine; the alkali compound is one or more selected from sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium hydrogen carbonate and potassium hydrogen carbonate; and the pH adjusting agent is at least one selected from sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, citric acid, acetic acid and salts thereof. characterized in that the copper salt is one or more selected from the group consisting of cupric sulfate salt, cupric chloride salt, cupric nitrate salt, cupric acetate salt and cupric sulfate ammonium salt; the metal salt is an inorganic acid salt or an organic acid salt of a metal selected from the group consisting of gold, silver, platinum, nickel, manganese, cobalt, chromium, zinc, palladium, rhodium, ruthenium, osmium, magnesium, iron and iridium; the reducing agent is one or more selected from the group consisting of metal copper, hydroxylamine, ferrous sulfate, ammonium vanadate, furfural, sodium hypophosphate, sodium hypophosphite, sodium hydrogen sulfite, glucose and phenyl compounds; the sulfur compound is one or more selected from sodium sulfide, sulfur dioxide, sulfurous acid, sodium sulfite, sodium hydrogen sulfite, sodium pyrosulfite, hyposulfurous acid, sodium hydrosulfite, sodium thiosulfate, potassium thiosulfate, ammonium thiosulfate, thiourea dioxide, hydrogen sulfide, formaldehyde sodium sulfoxylate; the catalyst is one or more selected from the group consisting of magnesium chloride, potassium chloride, calcium chloride, zinc acetate, ammonium chloride, ammonium sulfate, ammonium carbonate and ammonium nitrate; the polyamine is one or more selected from the group consisting of methylene diamine, ethylene diamine, trimethylene diamine, tetramethylene diamine, pentamethylene diamine, hexamethylenediamine, heptamethylenediamine, diethylene triamine, triethylene tetramine, tetraethylene pentamine and pentaethylene hexamine; the alkali compound is one or more selected from sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium hydrogen carbonate and potassium hydrogen carbonate; and the pH adjusting agent is at least one selected from sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, citric acid, acetic acid and salts thereof.