Disclosed in the present invention is a composition containing a ferrous amino acid chelate and a use thereof in the preparation of an anti-cancer medicament, wherein the medicament comprises an anti-cancer effective amount of a composition containing a ferrous amino acid chelate and a pharmaceutically acceptable carrier thereof. In the composition containing a ferrous amino acid chelate of the present invention, the amino acid, by maintaining a chelated state with the iron, can pass through the stomach, and does not influence changes in the body weight of the recipient； and the medicament prepared from the composition containing the ferrous amino acid chelate has the effect of inhibiting or treating cancers.
