A structure of a decorative hanging hook having a main body which is a connector with a light emitting member therein, wherein, the connector has on both ends thereof a hole for connecting respectively with a mountaineer carabine hook and an annular ring. Thereby, the entire decorative hanging hook can be directly hung on a backpack or a hanging loop on clothes or trousers with the annular ring thereof having keys or other ornaments. Above all, when being necessary, the light emitting diode on the light emitting member can be lightened by pressing a cover to provide a suitable effect of illumination.