The utility model belongs to a central hole positioning accurate-flanging die for an automobile muffler partition plate. The die comprises an upper die plate (1), an upper die base plate (3), a punch-die (4), a lower die plate (11), a lower die base plate (10), a stripper plate (9), a pressing plate (5) and a male die (8) and is characterized in that a positioning ring (7) is fixed to the center of the upper plane of the male die (8) which is installed in a central hole formed in the center of the partition plate (12), and the partition plate (12) is installed among a female die (6), the stripper plate (9) and the punch-die (4). When the central hole positioning accurate-flanging die machines the flanges of the muffler partition plate, the positioning ring and the central hole are used for positioning, uniformity of the heights of the flanges is ensured, product uniformity is improved, continuity is ensured for follow-up assembly, and working efficiency and product quality are improved. Central positioning points are concentrated, no positioning hole needs to be formed in other parts, the uniformity of the die is ensured, the strength of the die is improved, and the service life of the die is prolonged.