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This utility model relates to the field of petroleum mixing technology, specifically to a circulating mixing device for preventing sedimentation of petroleum additives. The device includes a mixing tank with a cover plate attached to its upper surface. A servo motor is fixedly connected to the upper surface of the cover plate, and the lower surface of the servo motor is fixedly mounted at the center of the upper surface of the cover plate. A fixing rod is fixedly connected to the output end of the servo motor through the inner wall of the cover plate. Multiple stirring rods and multiple stirring blades are fixedly connected to the surface of the fixing rod. A stirring disc is fixedly connected to the bottom end of the fixing rod. A first sampling tube is fixedly connected to the inner wall of the mixing tank, and a sampling cylinder is fixedly connected to the inner wall of the first sampling tube. In this utility model, when a piston moves upward within the sampling cylinder controlled by a pull rod, pressure draws a portion of the petroleum additive into a second sampling tube, facilitating sampling of the petroleum additive. The process is simple to operate and avoids contamination from other petroleum additives.