The present invention relates to the technical field of chemical medicine, and particularly relates to an antitumor compound or a pharmaceutically acceptable salt thereof, and uses of the antitumor compound or pharmaceutically acceptable salt thereof. According to the present invention, the provided compound has a structure represented by a formula I, and the pharmacological experiment results show that the compounds provide good inhibitory activity on a variety of tumor cell lines; and the compound provides selective inhibitory activity against colorectal cancer and breast cancer, further can inhibit the formation of the colorectal cancer cell HCT116 cell population, can block the SW620 cell cycle in the G0/G1 phase, and can concurrently promote the apoptosis of the two colorectal cancer cells such as HCT116 cells and SW620 cells. The formula I is defined in the specification.