The invention provides a slip ring system. An optical fiber branching device and an optical fiber collimation ejector are embedded into a slip ring part and an installation groove and a line groove are formed in the inner wall of the slip ring. The installation groove is used for fixing the optical fiber branching device. Thus, the problems that an optical fiber is prone to wobbling and damage due to pulling in a data transmission process in the slip ring system are solved. The line groove is used for fixing the optical fiber and the problem of an error code caused by wobbling of the optical fiber in a rotation process is solved. Accuracy of data transmission is improved.