The invention belongs to the technical field of plant cultivation, and particularly relates to a high pile grafting method for walnuts. Firstly dewatering is carried out on a cut scion to avoid the rot of the scion due to excessive water, the scion is immersed at high temperature with an indoleacetic acid solution, thereby suppressing the continuous growth of the scion and reducing the cell activity of the scion, the scion is sealed with wax and stored at low temperature, thereby reducing the growth activity of the scion, promoting the dormancy of the scion, and better facilitating later grafting, gibberellins and cytokinin are firstly adopted to immerse the scion before grafting, thereby breaking the dormancy state of the scion, the cytokinin promotes the differentiation of buds and the expansion of cells, thereby promoting the growth of the scion after grafting, being conducive to the survival of the scion, a scion seedling is selected from any one of Qian walnut tree No. 5, No. 6, No. 7 and No. 8 which have a planting history with many years, and it is ensured that fruits can be born in the second year after grafting.