Graded dwarfing cultivation method for michelia alba

The invention discloses a grading dwarfing cultivation method for michelia alba. The grading dwarfing cultivation method comprises the following steps: S1, planting grafted seedlings; s2, in the spring of the second year after field planting, topping and pinching are conducted at the position, 1-1.5 m high, of the michelia alba tree, and 5-8 first-level lateral branches are formed through cultivation; s3, trunk cutting in autumn and winter of the second year after field planting; s4, in the spring of the second year after trunk cutting, timely removing bud sticks germinating on the top and the periphery of the cut trunk, and carrying out branch pressing and dwarfing on the first-level branches; s5, multi-branch tree shape cultivation and tree height control are conducted, secondary branches which grow strongly and are wide in growth space continue to be subjected to layering and dwarfing, meanwhile, pruning and shaping are conducted on the multiple branches, topping is matched, a multi-branch michelia alba tr