Cultivation method for increasing resistance of fruit tree

The invention discloses a cultivation method for increasing the resistance of a fruit tree. The cultivation method comprises the steps of selecting a resistant rootstock, sowing seeds of the resistant rootstock, pinching for promoting the generation of branches of the rootstock when the rootstock grows to be 50cm-120cm long, grafting a needed variety on 2-6 branches according to the needs of a tree shape after the branches grow to a certain thickness which is suitable for grafting, meanwhile, cutting off main roots for promoting the generation and the growth of a large number of fibrous roots and fine roots through replanting again, and thus cultivating large fruit tree seedlings with branches and strong fibrous roots. According to the cultivation method disclosed by the invention, not only is the advantage of strong resistance of an underground part of the rootstock utilized, but also the advantage of strong resistance of an overground part of the rootstock is utilized, the increase of the whole resistance of the fruit tree is promoted, the resistance is enhanced after nursery stocks of the fruit tree are planted, the fruit tree can bear fruits in 2-3 years, and the fruiting period of the fruit tree is greatly quickened.