Top grafting, head changing, renewal and rejuvenation method for aging pear trees

The invention discloses a top grafting, head changing, renewal and rejuvenation method for aging pear trees. Belongs to the technical field of top grafting head changing. Comprising the following steps: (1) collecting annual developmental branches which are pure in variety, robust in growth, free of plant diseases and insect pests, full in bud and 0.8-1.2 cm in thickness from leaf falling to germination; (2) carrying out moisturizing treatment on the collected scions; (3) storing in a cellaring or inventory manner; (4) from the first ten days of April to the first ten days of May, 5%-10% of original branches of the pear trees are reserved, and top grafting and head changing are conducted on other rootstocks capable of bearing scions; and (5) performing tending management after grafting. Compared with the prior art, the method has the advantages that the survival rate of top grafting and head changing of the aging pear trees is increased through control over specifications, storage operation, single-plant scio