The invention discloses a late frost antifreezing agent for walnuts. The late frost antifreezing agent for the walnuts is characterized by being prepared by compounding a salicylic acid aqueous solution, a jasmonic acid aqueous solution, a benzoic acid aqueous solution, acetum of insect chitosan, trace element mother liquor, alcohol, glycerinum and water. According to the late frost antifreezing agent for the walnuts, the sprouting time of flower and leaves is delayed, and the late development of sprouts is promoted, so that the effect of preventing a walnut tree from late frost is realized; the antifreezing agent has the advantages that the sprouting time of the flower and leaves can be obviously delayed by 10 to 15 days under the same temperature condition, so that the time the walnut tree is damaged by the late frost in early spring can be effectively avoided.