Out-of-season big tree transplanting method

The invention discloses an out-of-season big tree transplanting method which includes digging for transporting, pruning and leaf trimming, root disinfecting, pond digging, fix planting and maintenance and the like. From last third of the June to the last third of the September, the diameter of a dug soil ball is 5-8 times that of the tree ground diameter, the height of the dug soil ball is 3-5 times that of the ground diameter, and the soil ball is wrapped by a bundling object and transported to the transplanting place; 40-60% of branches and 70-90% of leaves of a tree are pruned away, and 600-1000ml of rooting accelerant dilute solutions and 50-200g of bactericides are sprayed on the tree root; and a transplanting pond with the diameter to be 30-40cm larger than that of the soil ball and the depth to be 20-30cm larger than the diameter of the soil ball is dug, the bundling object on the big tree root is removed, the big tree is fixedly planted in the transplanting pond, planting soil is refilled and root setting water is sufficiently sprayed. Tests proves that the out-of-season big tree transplanting method can improve out-of-season big deciduous tree transplanting survival rate to be above 96%, is simple and practicable in operation and low in cost, is applicable to transplanting of normal big deciduous trees and transplanting and treating and cuing of deciduous ancient trees and famous trees, and has wide application and popularization prospect.