An automobile wheel cover includes a central hole, an adjusting block, a threaded element, and integrally formed with a bearing seat opposite an inner side of the central hole. An annular seat is extended from an inner side of the bearing seat and is defined with a plurality of slots, between each two slots is provided an elastic post. The adjusting block has a small diameter end and a large diameter end and is inserted in the annular seat via the small diameter end. The threaded element is threaded in the adjusting block via the bearing seat. Thereby, when screwing the threaded element, the large diameter end of the adjusting block moves in the annular seat to make the posts expanded outwardly and abutted against the shaft hole, which can apply to the automobile rims with different hole diameters and prevent the automobile wheel cover falling from the automobile rim.