The invention discloses an automotive body fixture, belonging to the technical field of automobile manufacturing. The automotive body fixture comprises a support, a corner seat, a connecting plate, a chuck and a cylinder, wherein the support is of a cuboid columnar structure, the corner seat is of an L shape, the bottom surface of the corner seat is fixed on the upper surface of the support, the vertical surface of the corner seat is fixed on the surface of the connecting plate, the end of the cylinder is provided with a connecting part and is connected with one side of the connecting plate, an expansion rod of the cylinder is connected with the end of the chuck, the chuck comprises a rectangular plate and an L-shaped plate perpendicular to the rectangular plate, one side of the rectangular plate is provided with a first limit base and a second limit base, the first limit base is of a Z shape while the second limit base is of a U shape, and a regulating block is also arranged on the L-shaped plate. According to the invention, the expansion rod of the cylinder is used for controlling the chuck to move flexibly, and therefore, the automotive body fixture can meet the clamping requirement of different types of automotive bodies.