The invention discloses a breeding method of Cercis canadensis. The method comprises the following steps: S1, rootstock cultivation; S2, cultivation of scion Cercis canadensis; S3, scion processing; S4, cutting of rootstock unions; S5, grafting; S6, management after grafting; S7, untying scions. The breeding method of Cercis canadensis can overcome the problem in the prior art. Therefore, survival rate of grafting is improved by preventing grafting cutting sections from changing colors due to oxidation during grafting of Cercis canadensis. As a result, survival rate of grafting of Cercis canadensis is higher.