The utility model provides an automotive engine exhaust system flange, including flange body, bottom plate, connecting piece, roof, hole, bottom hole and top hole, be provided with the bottom plate on the flange body, the center of bottom plate is provided with the bottom hole, and the both sides in bottom hole are provided with two holes respectively, and the upper end of bottom plate is connected with the lower extreme of connecting piece, the upper end and the roof connection of connecting piece, the center of roof is provided with the top hole, the flange body adopts foundry technology integration shaping, is provided with the through -hole of diameter 52 in the connecting piece, and the angle between connecting piece and the bottom plate be 45 degrees, and the diameter in top hole is 56.5, and the roof is the ring describes, and the internal diameter of bottom hole, top hole and connecting piece communicates with each other, and such design is favorable to exhaust system's noncongestion, the utility model has the beneficial effect of simple structure, reliable and stable, it is convenient to install, especially adapted using widely.