Breeding method of perennial wild watermelon rootstock variety

The invention discloses a breeding method of a perennial wild watermelon rootstock variety, which comprises the following steps: selecting a large number of wild watermelon germplasm materials, existing wild watermelon rootstock varieties and the like for sowing and planting, and investigating the physiological law of the thickness and the regeneration capacity of hypocotyl of wild watermelons; further determining the genetic law of coarse and short hypocotyl and regeneration capacity, and then carrying out polymerization transformation and purification on excellent traits of wild watermelon germplasm resources to obtain a female parent and a male parent of the perennial wild watermelon stock variety with excellent and stable traits. The finally obtained wild watermelon rootstock variety is short and thick in hypocotyl, easy to graft, developed in root system, high in regeneration capacity, high in grafting survival rate, high in scion plant growth vigor after grafting, high in watermelon fusarium wilt resist