The invention relates to a method for screening 
mycosphaerella melonis-resistant IL 14 of cucumber-pickled cucumber 
introgression line. According to batch treatment of different concentrations, plants with good resistance are screened, and the method belongs to the field of 
biotechnology breeding. The method comprises the following steps: by taking 
wild species pickled cucumber as a female parent, cultivating cucumber 'Beijing jietou' as a male parent, and hybridizing to obtain 
hybrid F1; combining the 
hybrid F1 with a somaclone variation 
chromosome reduplication technology by virtue of 
embryo rescue, thereby obtaining a fertile inter-specific 
heterologous tetraploid new species which is named as 
Cucumis hytivus; and by taking the 
heterologous tetraploid new species 
Cucumis hytivus as a female parent, performing 
system backcrossing and self-cross 
selective breeding with the cultivated variety 'Beijing jietou', thereby obtaining 86 parts of cucumber inter-specific 
introgression line materials carried with 
wild species chromosome segments, and respectively 
numbering as IL1-IL86. The 86 parts of 
introgression line groups are screened by adopting the 
greenhouse seedling stage artificial 
inoculation identification technology, stable moderate resistance or more strains are obtained by virtue of 
inoculation treatment in spring and autumn, the 
inoculation treatment is performed by increasing the concentration of bacterium, and the 
mycosphaerella melonis resistance strain IL14 is screened.