The invention relates to an automobile seat chair slide rail with an improved structure, and belongs to the technical field of automobile fittings. The automobile seat chair slide rail comprises a lower guide rail, an upper guide rail and a locking device, wherein the upper guide rail is in sliding fit with the lower guide rail by ball brackets, the upper guide rail is provided with lock claw grooves which are respectively in an inclined
cut shape, a reinforcing bracket is additionally arranged under an upper mounting surface, the upper guide rail and the lower guide rail are respectively provided with a circular arc-shaped raceway accommodating cavity, large steel balls and small steel balls of the ball brackets roll on the circular arc-shaped raceway accommodating cavities, the insides of one pair of folding edges of the lower guide rail are provided with lock row teeth, the locking device comprises a lock block, a
wrench, a connecting pin, a pull spring, a fixed block, a rotary shaft, a press spring, a
wrench spring and a connecting
pipe, the lock block is provided with lock claws which are matched with the lock claw grooves and the locked row teeth, the lock block is fixedly arranged on the
wrench, and the wrench is arranged between the upper guide rail and the lower guide rail. The automobile seat chair slide rail has the advantages that the locking strength is high, the
synchronism is high, the self-locking is avoided, the clearance is small, the sliding uniformity is high, the shaking clearance of the wrench is small, and the abnormal
noise in sliding is avoided; and meanwhile, the
processing and the manufacturing are convenient, the production cost is low, and the application range is wide.