Swing adjusting and rotating structure of exercise bicycle saddle

When a user sits on a saddle of the exercise bicycle and steps on the saddle, the saddle can be induced to swing leftwards and rightwards, the buffering effect of load dispersion can be achieved, the user can directly adjust the motion range of hip joints so that it can be guaranteed that the pelvis and the spine move stably during stepping, and when the user steps on the bicycle, the lower half body is exercised, and meanwhile the user can exercise the lower half body. A swing adjustment and rotation structure for a saddle of an exercise bicycle for exercising core muscles is provided with: a buffer part (100) provided on the bottom surface of a saddle member (8) so as to reduce the load and left-right fluctuations dispersed by the pedaling action of a user; a left-and-right moving part (200) that performs a left-and-right sliding operation in conjunction with the buffer part; a front-back moving part (300) coupled to the left-right moving part (200) to perform a forward/backward sliding operation; the eccen