A method for preparing a silver nanoparticle comprising the steps of: a. preparing a silver complex compound by reacting the silver compound represented by the following formula 1 with at least one selected from ammonium carbamate compound, ammonium carbonate compound or ammonium bicarbonate compound represented by the following formulas 2 to 4; and b. preparing a silver nanoparticle by reacting the silver complex compound prepared in the a) step with a reducer, or by reducing or pyrolyzing the silver complex compound by applying heat thereto, [Formula 1] Ag n X From the above formulas 1 to 4, X represents a substituent selected from oxygen, sulfur, halogen, cyano, cyanate, carbonate, nitrate, nitrite, sulfate, phosphate, thiocyanate, chlorate, perchlorate, tetrafluoro borate, acetylacetonate, carboxylate, and the derivatives thereof; n represents integers of 1 to 4; wherein the ammonium carbamate compounds of the formula 2 are at least one selected from ethylammonium ethylcarbamate, isopropylammonium isopropylcarbamate, n-butylammonium n-butylcarbamate, isobutylammonium isobutylcarbamate, t-butylammonium t-butylcarbamate, 2-ethylhexylammonium 2-ethylhexylcarbamate, octadecylammonium octadecylcarbamate, 2-methoxyethylammonium 2-methoxyethylcarbamate, 2-cyanoethylammonium 2-cyanoethylcarbamate, dibutylammonium dibutylcarbamate, dioctadecylammonium dioctadecylcarbamate, methyldecylammonium methyldecylcarbamate, hexamethylene imineammonium hexamethylene iminecarbamate, mopholinium morpholinecarbamate, pyridinium ethylhexylcarbamate, triethylene diaminium isopropylbicarbonate, benzylammonium benzylcarbamate, triethoxysilylpropylammonium triethoxy silylpropylcarbamate, and the derivatives thereof; the ammonium carbonate compounds of the formula 3 are at least one selected from ethylammonium ethylcarbonate, isopropylammonium isopropylcarbonate, n-butylammonium n-butylcarbonate, isobutylammonium isobutylcarbonate, t-butylammonium t-butylcarbonate, 2-ethylhexylammonium 2-ethylhexylcarbonate, 2-methoxyethylammonium 2-methoxyethyl carbonate, 2-cyanoethylammonium 2-cyanoethyl carbonate, octadecylammonium octadecylcarbonate, dibutylammonium dibutylcarbonate, dioctadecylammonium dioctadecylcarbonate, methyldecylammonium methyldecylcarbonate, hexamethylene imineammonium hexamethylene iminecarbonate, morpholineammonium morpholinecarbonate, benzylammonium benzyl carbonate, triethoxysilylpropylammonium triethoxysilylpropylcarbonate, triethylene diaminium isopropylcarbonate, and the derivatives thereof; and the ammonium bicarbonate compounds of the formula 4 are at least one selected from isopropylammonium isopropylbicarbonate, t-butylammoniumbicarbonate, 2-ethylhexylammonium bicarbonate, 2-methoxyethylammonium bicarbonate, 2-cyanoethylammonium bicarbonate, dioctadecylammonium bicarbonate, and the derivatives thereof. a. preparing a silver complex compound by reacting the silver compound represented by the following formula 1 with at least one selected from ammonium carbamate compound, ammonium carbonate compound or ammonium bicarbonate compound represented by the following formulas 2 to 4; and b. preparing a silver nanoparticle by reacting the silver complex compound prepared in the a) step with a reducer, or by reducing or pyrolyzing the silver complex compound by applying heat thereto, [Formula 1] Ag n X From the above formulas 1 to 4, X represents a substituent selected from oxygen, sulfur, halogen, cyano, cyanate, carbonate, nitrate, nitrite, sulfate, phosphate, thiocyanate, chlorate, perchlorate, tetrafluoro borate, acetylacetonate, carboxylate, and the derivatives thereof; n represents integers of 1 to 4; wherein the ammonium carbamate compounds of the formula 2 are at least one selected from ethylammonium ethylcarbamate, isopropylammonium isopropylcarbamate, n-butylammonium n-butylcarbamate, isobutylammonium isobutylcarbamate, t-butylammonium t-butylcarbamate, 2-ethylhexylammonium 2-ethylhexylcarbamate, octadecylammonium octadecylcarbamate, 2-methoxyethylammonium 2-methoxyethylcarbamate, 2-cyanoethylammonium 2-cyanoethylcarbamate, dibutylammonium dibutylcarbamate, dioctadecylammonium dioctadecylcarbamate, methyldecylammonium methyldecylcarbamate, hexamethylene imineammonium hexamethylene iminecarbamate, mopholinium morpholinecarbamate, pyridinium ethylhexylcarbamate, triethylene diaminium isopropylbicarbonate, benzylammonium benzylcarbamate, triethoxysilylpropylammonium triethoxy silylpropylcarbamate, and the derivatives thereof; the ammonium carbonate compounds of the formula 3 are at least one selected from ethylammonium ethylcarbonate, isopropylammonium isopropylcarbonate, n-butylammonium n-butylcarbonate, isobutylammonium isobutylcarbonate, t-butylammonium t-butylcarbonate, 2-ethylhexylammonium 2-ethylhexylcarbonate, 2-methoxyethylammonium 2-methoxyethyl carbonate, 2-cyanoethylammonium 2-cyanoethyl carbonate, octadecylammonium octadecylcarbonate, dibutylammonium dibutylcarbonate, dioctadecylammonium dioctadecylcarbonate, methyldecylammonium methyldecylcarbonate, hexamethylene imineammonium hexamethylene iminecarbonate, morpholineammonium morpholinecarbonate, benzylammonium benzyl carbonate, triethoxysilylpropylammonium triethoxysilylpropylcarbonate, triethylene diaminium isopropylcarbonate, and the derivatives thereof; and the ammonium bicarbonate compounds of the formula 4 are at least one selected from isopropylammonium isopropylbicarbonate, t-butylammoniumbicarbonate, 2-ethylhexylammonium bicarbonate, 2-methoxyethylammonium bicarbonate, 2-cyanoethylammonium bicarbonate, dioctadecylammonium bicarbonate, and the derivatives thereof.