The invention relates to essence with the fragrance of thick broad-bean sauce and a preparation method of the essence. The essence is prepared from furanone, methyl cyclopentenolone, ethyl vanillin, ethyl maltol, propanediol, 2-acetyl pyrrole, butyric acid, anisic aldehyde, 4-methyl-5-ethoxyl-thiazole, 4-methyl-5-acetoxy ethyl thiazole, ethyl myristate, phenylethyl phenylacetate, 4-guaethol, 2-acetyl furan, 3-methylmercapto-propanol, lactic acid, 2-methylpyrazine, 2,3,5-trimethylpyrazine, 2-acetyl thiazole, 3-methylmercapto-propanal, ethyl butyrate and glacial acetic acid. According to the essence, the specific property of the fragrance of the thick broad-bean sauce is ensured, and the essence has the joyful sour and sweet sauce fragrance, is lasting, comfortable, strong and stable in fragrance, and has the note which is the same as that of the characteristic fragrance of the thick broad-bean sauce. In addition, the heat resistance of the essence is higher than that of the fragrance of the thick broad-bean sauce, and the fragrance retention period is also longer than that of the fragrance of the thick broad-bean sauce. The method for preparing the essence is simple and is suitable for large-scale production, and the essence is easy to produce in a large scale.