The invention discloses a propeller centroid detection device, belonging to the technical field of automatic detection. The propeller centroid detection device comprises a hydraulic system, a suspension system, a centering system and a detection system. The hydraulic system comprises an oil tank and an oil pipe. After the oil tank is opened, hydraulic oil flows into the suspension system through the oil pipe. A fixed ball piston in the suspension system is arranged at the top of a supporting shaft, and a floating ball socket piston sleeves the fixed ball piston. The centering system comprisesa suspension cylinder, an upper self-centering three-jaw chuck and a lower self-centering three-jaw chuck. The suspension cylinder sleeves the floating ball socket piston, and the outer ring of the suspension cylinder is sleeved with the lower self-centering three-jaw chuck, a propeller and the upper self-centering three-jaw chuck sequentially from bottom to top. The detection system comprises sensor detection assemblies, a data processing module and an upper computer. The propeller centroid detection device has the advantages of high detection accuracy, large bearing capacity, simple system composition, strong maneuverability, low cost and the like, and is particularly suitable for the field of centroid detection of large propellers.