The present invention discloses a yo ball having a friction kinetic energy storage and acceleration functions comprises two rotating bodies and the connecting shaft. Any of the rotating body, comprises a disk body and the side cover, none of the disk body, the and the internal friction kinetic energy storage mechanism is provided, one end of the friction kinetic energy storage mechanism is connected to the disc member and, the other end is connected to the side cover. This yo ball, by picking side cover is brought into contact with the disc member to an external contact surface, the friction roll, and is adapted to store energy in friction kinetic energy storage mechanism. After the energy storage, and remove the disk body from contact with the outside contact surface, and friction kinetic energy storage mechanism, to release the energy, then driven to rotate synchronize the disk body, to release the side cover at the same time, yo-yo ball so that the entire body is rotated. Thus, even if the cord is too short, it can be rotated at a high speed after throwing a ball body, the high speed rotation, after dumped ball body, not affected by the acceleration region. Therefore, even in low-profile player, looking forward to the play of the yo-yo ball to the fullest, it is possible to bring about a variety of acrobatic movement. So that the age and the back height is satisfied each of the requirements of different players. In comparison with the existing yo-yo ball, this yo-yo ball having a friction kinetic energy storage and acceleration capabilities, to expand the new operation mode and new playing method, further enhanced the interest, and be more diversified how to play can.