The invention belongs to the technical field of grafting, in particular relates to a method of grafting macadamia nut. The method comprises the steps of S1, seed treatment, S2, stock culture, S3, scion cultivation, S4, grafting, and S5, management after grafting. The macadamia seeds are treated at a low temperature before sowing, when the seeds germinate and grow to 0.3-0.5 centimeter in stem length, they are used as the rootstock, the non-lignified branches produced by the grown grafted female parent are used as the grafted rootstock, in the grafting process, the rootstock and the scion are treated using a plant growth regulator, after the grafting process, the temperature and humidity are controlled, and fertilizer is applied, the grafting survival rate of the macadamia nuts is improved; when the seeds germinate and grow to 0.3-0. 5 centimeter in stem length, they are used as the rootstock, then grafted, and when they survive after the grafting process, the seedling rearing step is directly conducted, and the time used for seedling rearing is shortened.