The invention mainly relates to the field of planting technology, and discloses a method for promoting the differentiation of Trichosanthes mellifera seedlings, including: selection and treatment of explants, preparation of medium, inoculation of explants, induction of differentiation and cultivation; Induced differentiation during basket tissue culture, after 16 days of culture in B5 medium, yellow-green cell protrusions began to appear, and then differentiated bud clusters appeared, which significantly shortened the time for induction of differentiation, improved planting efficiency, and increased economic income by 16.2%; As an explant, it will not cause damage to the Trichosanthes plant, does not affect the growth and results of Trichosanthes, and the source of young leaves is extensive, and tissue culture can be carried out at any time, and the planting efficiency is significantly improved; Salt water, acetic acid solution and nutrient solution treatment, avoid using too much disinfectant for repeated disinfection, save costs, and allow explants to continue absorbing and accumulating nutrients in a slightly acidic environment, speeding up the process of inducing differentiation of explants.