Synchronous braking structure for bicycle front and rear wheels

The utility model relates to a synchronous braking structure for a front and a rear wheels of a bicycle. The utility model comprises a frame. A rotating element is combined to an axle tube of the frame in a rotary way; the circumference position of the rotating element is used for penetrating and fixing the head parts of a front and a rear brake lines; the rotating element is provided with two containing chambers for embedding two rod bodies to form two pushing and stopping parts for pushing and stopping the two rod bodies. The end positions of the two rod bodies can be respectively penetrated with a brake control line which is directly connected with grab handles of the bicycle. Thus when any brake control line is pulled, the brake control lines can drive the rotating element to rotate to drive the front and the rear brake lines to synchronously actuate and brake. Thus the front and the rear brake lines can be simultaneously actuated by utilizing single brake grab handle.