Ball joint device

The invention provides a ball joint device including a ball joint part and a connection part; the ball joint part is provided with a first spherical junction part provided with a first surface; the connection part is provided with a first bearing part, a first fixing part, a first cambered surface and a second cambered surface, and the first bearing part is matched with the first fixing part so as to make the first spherical junction part rotatablely arranged at the connection part; when the first spherical junction part is arranged at the connection part, the first cambered surface and the second cambered surface form interference with the first surface respectively, and the first cambered surface is not consistent with the second cambered surface. Therefore, the problem of uneven applied force caused by component allowance can be overcome.