The invention discloses a linkage self-locking type car hub fixing device. The device comprises a first rod body, a second rod body, a driving mechanism, a supporting platform, a first clamping jaw and a second clamping jaw, wherein the first rod body and the second rod body are arranged in a crossed mode, the driving mechanism is used for driving the first rod body and the second rod body to rotate, and the supporting platform is used for supporting a hub. According to the linkage self-locking type car hub fixing device, a first thread part and a second thread part are arranged on the first rod body and the second rod body correspondingly, the thread rotation directions of the first thread part and the second thread part are opposite, the supporting platform is located between the first thread part and the second thread part, and the first clamping jaw and the second clamping jaw are matched with the first thread part and the second thread part in a threaded mode correspondingly, so that when the first rod body and the second rod body rotate, the first clamping jaw and the second clamping jaw simultaneously move towards the supporting platform so as to clamp and fix the hub placed on the supporting platform. The device is simple and compact in structure, good retaining and locking capacities are achieved, the clamping jaws cannot be loosened, and clamping is steady and firm.