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This utility model relates to the field of surface treatment technology for cast iron parts, and discloses a surface treatment device for cast iron parts, including a base. Two support rods are fixedly connected to the top of the base. A centering mechanism is provided on the outer adjacent side of the two support rods. Cleaning mechanisms are provided on both outer sides of the two support rods. A grinding mechanism is provided on the top of the base. A placement plate is fixedly connected to the top of the centering mechanism. The centering mechanism includes a sliding plate, which is slidably connected to the outer adjacent side of the two support rods. Sliding grooves are formed inside the two support rods. In this utility model, the support plate, support block, and rotating rod are linked by a telescopic rod, enabling the two centering frames to accurately clamp the cast iron parts, improving centering accuracy and stability, and effectively preventing the cast iron parts from shifting during grinding. The sliding rod and extension rod in the extension assembly can be flexibly adjusted according to the height of the cast iron parts.