The invention relates to the technical field of automobile parts, in particular to a mounting structure for connecting a fixed window at the rear of an automobile with a decorative panel and an automobile. The mounting structure for connecting the fixed window at the rear of the automobile with the decorative panel comprises a first connecting portion and a second connecting portion, wherein the second connecting portion is connected with an automobile side plate through a connector; the first connecting portion is provided with a folded corner portion; a first extension portion which extendsaway from the direction of the automobile side plate and a second extension portion which extends towards the direction of the automobile side plate from the first extension portion are arranged at one end of the folded corner portion; the first extension portion and the folded corner portion form a clamping groove for clamping the decorative panel; the second extension portion is connected with asealing lip of the fixed window at the rear of the automobile; the bottom surface of the second extension portion is abutted to the outer surface of the automobile side plate; by external load, whichacts on the second extension portion, of the fixed window at the rear of the automobile, the second extension portion is attached to the outer surface of the automobile side plate tightly, the sealing property is improved effectively, and sound insulation and noise reduction are achieved; and the mounting structure is simple in structure and simple and convenient to assemble.