The invention discloses a single plant forming splicing cultivation method for the tree. The method comprises the following steps of S1, selecting trees; S2, cutting off cuticular layers at the same height positions of the two trees, spraying a copper sulfate solution at positions where the cuticular layers are cut off, clasping the two trees together, and then tying the two trees together with straps; S3, smearing a protective agent on the edges of the positions where the cuticular layers are cut off of the two trees, and applying lime to the upper and lower sides of the positions 10 cm awayfrom the positions where the cuticular layers are cut off of the two trees; S4, spraying a nutrient solution and a hormone mixture to the places where the cuticular layers are cut off of the two trees, and applying nutrient soil to the roots of the two trees simultaneously. According to the method, by splicing the two trees, different trees can be spliced into one plant, the spliced trees have good styling effect and richer variety, the trees can be grown and formed according to the design of people, and the splicing of the trees is more in line with wishes of the people.