The invention discloses a method for curing after opening of a thick white liquor pit, belonging to the technical field of brewing. Due to the adoption of the method, mixed bacteria can be prevented from polluting the pit, and the quality of the pit can be kept effectively. The method comprises the following steps of: a, curing by adopting the following measure within 36 hours after pit opening: opening the pit, and covering the pit with a material with sealing performance in time; and uniformly spraying tail water of 20-35 DEG C onto pit walls and the pit bottom every 1-6 hours, wherein the using amount of tail water applied to the pit walls and pit bottom in every square meter is 2-4 kilograms; and b, curing by adopting the following measure within 36 hours after pit opening: uniformly spraying tail water of 20-35 DEG C onto pit walls and the pit bottom every 1-6 hours, wherein the using amount of tail water applied to the pit walls and pit bottom in every square meter is 2-4 kilograms; and uniformly spraying daqu-containing tail water of 20-35 DEG C onto pit walls and the pit bottom every 8-12 hours, wherein the using amount of tail water applied to the pit walls and pit bottomin every square meter is 2-4 kilograms; and the using amount of the daqu is 0.1-0.3 kilogram. The method can be used for effectively curing a thick white liquor pit.