The invention discloses low-temperature sintering gold paste and a preparation method thereof. The paste comprises 5-10% of organic resin, 10-20% of solvent, 2-5% of additive and 65-83% of gold powder, wherein the resin is one or more of cellulose nitrate, ethyl cellulose and hydroxyethyl cellulose. By the gold paste, low-temperature sintering can be achieved, and the gold paste is good in conductivity and excellent in reliability and is applicable to an electronic device with relatively high requirement on reliability.