The utility model discloses a clamping structure for an outer decorating strip of an A column of a car, mainly comprising an outer decorating strip main body and a main frame and a secondary frame which are used for fixing the outer decorating strip main body through connecting; a region section of the outer decorating strip main body arranged between the main frame and the secondary frame forms a clamping heat part of the outer decorating strip main body; the clamping head part is clamped in a clamping region between the main frame and the secondary frame; the outer surface of the main frame is provided with a foam double-faced adhesive tape; one end of the secondary frame is provided with a secondary frame extension part; and a limit bulge is arranged at one corner at one end of the secondary frame extension part adjacent to the clamping head part of the outer decorating strip main body. The clamping structure is simply structured, and is simultaneously added with the limit bulge through prolonging the length of the secondary frame so that a gap between the clamping head part and the secondary frame is reduced, the moving space of the clamping head part is reduced, and the excellent claming capacity is stilled ensured under the vibration action, thus the outer decorating strip of the A column of the car does not fail in installation caused by separation resulting from external forces such as vibration and the like.