Fixing device and passenger car front roof structure

The utility model relates to a fixing device which comprises a base and an adjusting assembly, the adjusting assembly comprises a support and a self-locking telescopic mechanism, and the two ends of the self-locking telescopic mechanism are rotationally connected with the support and the base respectively. A front top structure of a passenger car comprises a front top decorating part and a plurality of fixing devices, bases in the fixing devices are arranged on a top cover of the passenger car, and supports in the fixing devices are connected with the top wall, the side wall or the front wallof the front top decorating part. The beneficial effects of the utility model are that: the utility model discloses: the beneficial effect is: In use, the bracket is fixed with the front top decorating part; the base is fixed with a top cover of the passenger car; and the two ends of the self-locking telescopic mechanism are rotationally connected with the support and the base correspondingly, sothat when the gap needs to