The invention discloses a method for repairing damaged Australian nut trees. The method comprises the steps of cutting off a damaged part, selecting a repair branch, performing grafting and performing post-grafting nursing, the damaged Australian nut trees are repaired, a wound healing agent composed of cytokinin, heteroauxin, brassinolide, chitin and water is adopted for promoting Australian nut tree wound healing, a nutrient solution composed of urea, amino acid, monopotassium phosphate, matrine, beauveria bassiana, gibberellin, chitin, saccharose, boric acid and water is adopted for rapidly recovering the tree vigor. The method has the good repair effect on the damaged Australian nut trees, the repair success rate reaches up to 95% or above, operation is easy, the medicament cost is low, after restoration, trial production can be performed in the next year, the original yield can be recovered in the third year, and the method is suitable for being used and popularized.