Fixed connector for speed changing box and transmission case

The invention discloses a fixed connector for a speed changing box and a transmission case, and belongs to the technical field of automobile transmission systems. The problem that when the automobilespeed changing box and the transmission case are connected only through a spline shaft head and a spline shaft sleeve, the stability is poor is solved. A speed changing box connecting disc is providedwith a speed changing box transmission shaft penetrating hole, multiple first through holes, multiple second through holes and multiple third through holes, the multiple second through holes correspond to multiple connecting screw holes formed in a first joint and a second joint of the speed changing box one to one, and the multiple through holes correspond to multiple connecting screw holes formed in a speed changing box hanging bracket of the speed changing box one to one; and a transmission case connecting disc is provided with a transmission case input shaft penetrating hole, multiple fourth through holes, multipl