The invention discloses a soybean processed food with high Gamma-amino acid content and a production method thereof, which belong to the field of the soybean processed food. The method comprises the following steps: ground soybean is preserved at the temperature of 20 DEG C to 60 DEG C for 12 hours in the presence of proteolytic enzyme, thus obtaining the products of soybean curd, soybean milk, soybean curd residue and the like which contain over 10mg of Gamma-amino acid in every 100g net weight. The products of the invention have good taste and flavor, and can safely and completely achieve the effect of the Gamma-amino acid in daily life. The soybean processed food of the invention can play a favorable role in preventing and relieving various diseases such as hypertension, etc., can be directly taken as food, health food, food for patients, feeds and the like, and can be added to various food as health fortifying food containing Gamma-amino acid.