The invention relates to the technical field of automobile body components, in particular to an installation structure of a rear windshield and an automobile. The installation structure of the rear windshield is provided and comprises a first connecting part and two second connecting parts, all of which are used for connecting an automobile rear cover with the rear windshield. The two second connecting parts are arranged on the two sides of the rear windshield and used for limiting the displacement of the rear windshield in the vertical direction of the automobile rear cover. The first connecting part is arranged between the two second connecting parts and used for limiting the displacement of the rear windshield in the automobile body width direction of the automobile rear cover. Comparedwith an existing adopted two-portion connecting mode, an adopted three-portion connecting mode has the beneficial effects that the operation requirement for assembly personnel is reduced, assembly time is shortened, and production efficiency can be improved; and the two second connecting parts are combined with the first connecting part arranged between the two second connecting parts, the relative displacement of the rear windshield and the automobile rear cover is effectively limited, the structural stability of the whole automobile is higher, the appearance effect is good, and safety is high.