The invention discloses a soft soil curing agent composed of a main agent and an adjuvant, wherein the main agent is composed of cements, sands, lime, fly ash, slag cement, gypsum, nanometer silicon based oxides and the like, the adjuvant comprises triethanolamine, calcium lignosulfonate, sodium chloride, magnesium chloride, calcium chloride, ferric chloride, light vanadium or water glass, polyacrylamide, calcium sulfate, sodium sulfate, sodium hydroxide and the like. The invention has the advantage of perfect service effect, and is capable of being used as powder (for dry spraying) or pulp agent (for wet spraying) in cement injection pile construction, and further can be used in constructions of cement mixing pile, grouting, chemical churning pile, shallow layer cushion reinforcement, subgrade strengthening, tamping and the like.