Pre-positioning installing structure of back panel

The utility model relates to automotive parts, in particular to a pre-positioning installing structure of a back panel, which can ensure the assembling accuracy of a back panel, side panels and a back floor board on a welding and splicing station. The installing structure comprises the back panel and the side panels arranged on two sides of the back panel, wherein the back panel is provided with a projection-welding bolt, and bolt passing holes are arranged at the positions of the side panels, corresponding to the projection-welding bolt. The pre-positioning installing structure has the benefits that the back panel is assembled with the side panels through the projection-welding bolt, the relative positions of the back panel and the side panels are ensured, the back panel is not easy to sway during the follow-up assembling, the back panel and the side panels are assembled with the back floor board more easily, the assembling accuracy is relatively high, and the follow-up installation of the parts is facilitated.