Method for preventing excessive browning reaction due to improper tobacco leaf curing

The invention discloses a method for preventing excessive browning reaction due to improper tobacco leaf curing and belongs to the technical field of cigarette manufacturing. The method for preventing the excessive browning reaction due to the improper tobacco leaf curing includes that soaking tobacco leaves after harvesting and before preparing, wherein the soaking method includes that flatly paving the tobacco leaves in a rectangular water tank full of walnut waste extract and synergist solution and soaking for 3 to 5 minutes. The soaking method is capable of inhibiting the activity of polyphenol oxidase (PPO), reducing the browning reaction and improving the tobacco leaf curing effect, and the walnut waste is walnut green husk or walnut shell. The tobacco leaf browning reaction can be effectively inhibited through combining the walnut waste extract with the synergist (kojic acid and ferulic acid), and the luminous yellow tobacco leaf proportion is improved by 5-20%.