The invention discloses a medicament of a 1,3,4-oxadiazole containing pyrazole compound prepared for treating tumor, which comprises 1,3,4-oxadiazole containing pyrazole compound, and a pharmaceutical acceptable salt thereof as shown in the formula (I), wherein in the formula (1), R1, R2 and R3 refer to H, halogen, C1-C6 alkyls, aryl, C1-C4 alkoxys or nitryls; n refers to 1, 2, 3, or 4; and the halogen is fluorine, chlorine, bromine or iodine. The compound or pharmaceutical acceptable salt thereof is an acid added salt formed by the compound shown in the formula (I) and the following acids: a hydrochloric acid, a sulfuric acid, a benzenesulfonic acid or a p-toluenesulfonic acid. The medicament comprises a solvate of the compound shown in the formula (I) and water, ethanol, ethyl ether or acetone. The medicament has an inhibitory effect on human liver cancer cells. The compound shown in the formula (I) is a drug which can be used for preventing and treating related diseases such as various abnormal cell proliferation and morphologic changes and the like, and especially used for treating and preventing tumor diseases.