The disclosure concerns an injectable composition of paclitaxel, more particularly, an injectable composition of paclitaxel having excellent anticancer effect comprising solubilizer such as polyoxyl hydrogenated castor oil, anhydrous ethanol and stabilizer such as N-acetyl amino acid. The injectable compositions of paclitaxel provide a medical effect higher than that of the known compositions showing not only a lower toxicity but also superior solubility of paclitaxel and stability at room temperature, thus enabling venous injection by having fine particles.