The invention relates to a class of diarylethene LSD1 / HDACs dual-target inhibitors containing a hydroxamic acid group, a preparation method and application thereof in the preparation of antitumor drugs, and belongs to the technical field of medicinal chemistry. Described compound has following general formula: wherein preferably 3-position or 4-position unit is substituted; R 2 OH, OCH are preferred 3 , F, H; R 3 Preferably H, CH 2 OH;R 4 Preferably H, CH 3 , F, OCH 3 ;R 5 H, OH, CH preferred 2 OH, CH 3 , F, OCH 3 ; X is N or CH; Y is N or CH. The compounds of the present invention have strong inhibitory activities on both LSD1 and HDAC1 / 6, and have good selectivity for LSD1, and a plurality of compounds have strong inhibitory effects on human colon cancer HCT-116 cell line and human gastric cancer MGC-803 cell line The in vitro antitumor activity is better than the marketed drug SAHA. It provides a basis for the research and development of LSD1 / HDACs dual-target inhibitor drugs, which can be used as candidates for further development or lead compounds for the development of anti-tumor therapeutic drugs.