The invention discloses a method for carrying out indoor large-scale diadegma semiclausum hellen breeding. The method comprises the steps of (1) cultivation of a host plant of plutella xylostella linnaeus; (2) indoor breeding of the plutella xylostella linnaeus; (3) indoor breeding of the diadegma semiclausum hellen; (4) parasitism of the plutella xylostella linnaeus; (5) feeding of parasitized plutella xylostella linnaeu larvae; (6) disease prevention during the feeding of the parasitized plutella xylostella linnaeu larvae; (7) pupation of the parasitized plutella xylostella linnaeu larvae. According to the method for carrying out the indoor large-scale breeding of the diadegma semiclausum hellen, disclosed by the invention, has the advantages that the method is scientific and reasonable, the operation is simple, convenient and practical, the diadegma semiclausum hellens can be bred in the large scale according to biological characteristics and reproductive behavior requirements of the plutella xylostella linnaeus and the diadegma semiclausum hellen, and thus the field application and the commercialization need of agricultural production can be met.