When feeding Tenebrio molitor the cost of feed accounts for about 80% of the total feeding cost. In order to effectively reduce the cost of large-scale feeding Tenebrio molitor it is planned to use the corn straw CS after fermentation as the conventional feed for Tenebrio molitor. The effects of corn straw fermented by different bacterial combinations on the growth of Tenebrio molitor were studied. Firstly fermented corn straw was used to breed Tenebrio molitor and then the straw treatment conditions that were most conducive to the growth of Tenebrio molitor were screened out with the growth rate of Tenebrio molitor as the index. The final results showed that the utilization rate of corn straw feed fermented with a combination of Trichoderma viride TV Aspergillus niger AN Sporotrichum thermophile ST Bacillus subtilis BS Aspergillus oryzae AO and Candida utilis CU was significantly increased p<0. 05. The feed had a good growth effect after feeding Tenebrio molitor. The growth rate was also higher than that of Tenebrio molitor fed with pure wheat bran and the mortality was the same as that of Tenebrio fed with pure wheat bran. Therefore the corn straw fermented by this method can be used as a partial or complete substitute for the feed of Tenebrio molitor which provides a substantial basis for the production of a new feed of Tenebrio molitor in the future so as to effectively reduce the related breeding costs of Tenebrio molitor