A yo-yo is provided, which comprises a connecting shaft and two rotary bodies. At least three circular plates are arranged on each rotary body, wherein, the circular plates comprises an internal-lateral plate at the internal side, an external-lateral plate at the external side and a weight balance plate in the middle. The middle weight balance plate is clipped between the internal-lateral plate and the external-lateral plate. An integral short screw rod and a screw hole, which is matched with the short screw rod, are respectively positioned at the center of the internal-lateral plate and the external-lateral plate, forming a screw thread spiral connecting structure. The diameters of the internal-lateral plate and the external-lateral plate are less than the diameter of the middle weight balance plate, and the internal-lateral plates of the two rotary bodies are connected by a connecting shaft. The yo-yo product of the utility model can be repacked as per the requirement or preference of the teenagers. The rotation performance or overall figure of the utility model can be changed for fitting various playing patterns and meeting the requirements of various players. Moreover, the replacement of the middle weight balance plate is simple.