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This invention discloses a benzamide / benzenesulfonamide compound containing an aryl butanone structure, its preparation method, and its application, belonging to the field of medicinal chemistry. The structure of the benzamide compound containing the aryl butanone structure is as follows: R1 is hydrogen, halogen, alkyl, or alkoxy; R2 is tert-butyl, tert-pentyl, tert-octyl, adamantyl, or α,α-dimethylbenzyl; R3 is hydrogen, halogen, alkyl, alkoxy, fused ring, or aryl; R4 is hydrogen, alkyl, or aryl. The structure of the benzenesulfonamide compound containing the aryl butanone structure is as follows: R1 is hydrogen, halogen, or alkyl; R2 is tert-butyl, tert-pentyl, or tert-octyl; R3 is hydrogen, halogen, alkyl, or fused ring. The advantages of this invention are that some of the prepared compounds exhibit strong inhibitory effects on MCF-7 and HCT-116, and can be used as lead compounds for the subsequent preparation and development of antitumor drugs.