The invention discloses a train body of a high-speed motor train unit and an outer windshield mounting structure. The outer windshield mounting structure is characterized in that the structure comprises a mounting base and a bolt assembly, the bolt assembly comprises bolts which are provided with head parts (31) and screw rod parts (32), a sliding groove (1a) is formed in the side face of the mounting base (1), and the width size of an opening (1b) of the sliding groove (1a) is smaller than the groove width size, larger than the diameter size of the screw rod parts (32) and smaller than the radial dimension of the head parts (31) of the bolts; the head parts (31) of the bolts are clamped into the sliding groove (1a) from one side of the sliding groove (1a) and are positioned in the sliding groove (1a) through positioning parts, and the positioning parts are detachably mounted on the mounting base. Before an outer windshield is mounted, the head parts of the bolts are fixed on the mounting base through the positioning parts, in this way, when an inner windshield is mounted, the bolts do not need to be held by hands, only nuts need to be screwed on the screw rod parts, the nuts and the bolts can be quickly matched to be mounted, the mounting efficiency of the outer windshield is improved, and quick replacement is facilitated after threads fail.