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This invention belongs to the field of crankshaft machining technology, specifically a self-rotating clamping device for machining motor crankshafts. Addressing the problem in existing technologies where there is no equipment that can arbitrarily place the crankshaft for alignment and clamping to detect rotational deviations, the following solution is proposed: A base housing is included, with a moving mechanism located between the bottom sides of the base housing. A groove is formed on the top of the base housing, and a clamping main housing is bolted into the groove. An inner base is welded to the inner wall of the clamping main housing. The invention uses an air pump to fill the air storage chamber through the air inlet channel of the lifting column, causing the lifting support block to rise and contact the crankshaft's rotational position. Because the top of the swing clamping seat is arc-shaped and hinged, the two first clamping rollers at the top contact the bottom circumference of the crankshaft's rotational bottom, allowing the crankshaft to rotate.