The utility model discloses an exercise bicycle which comprises a frame, a flywheel, a handrail, pedal plates and a saddle, wherein a group of arc-shaped fixed plates with holes are arranged on the frame; the saddle comprises a seat cushion, a seat cushion supporting pipe, a horizontal adjusting supporting pipe and a vertical adjusting supporting pipe; one end of the seat cushion supporting pipe is connected with the arc-shaped fixed plates on the frame through a bolt and a matched nut; a part below the other end of the seat cushion supporting pipe is fixedly connected with a shock absorber for the frame; and the shock absorber can be a spring shock absorber or a rubber bar with a rotating body structure or a pneumatic spring damper. The exercise bicycle has the advantages that the design of the shock absorber is increased, the shock-absorption effect is good, the use comfort is increased, and the service life of the seat cushion is prolonged.