A transmission mechanism comprises a shell; a first shaft, a second shaft and a third shaft are arranged in the shell, wherein the first shaft and the second shaft are located on a same straight line, and the third shaft is arranged in parallel with the first shaft; the first shaft is coaxially provided with a bearing and a first gear; penetrating openings are formed in the surface of the first gear; a base for hydraulic rods is consolidated on the bearing; a tension rod is consolidated on the head part of each hydraulic rod; after penetrating through each opening of the first gear, the corresponding tension rod is hinged to a tension tooth; the second shaft is coaxially provided with a second gear and a long pinion consolidated on the side face of the second gear; the long pinion meshes with the tension teeth; the second shaft is coaxially provided with a third gear and a fourth gear; the third gear meshes with the second gear; and the fourth gear meshes with the first gear. According to the transmission mechanism disclosed by the invention, power is provided by adopting the hydraulic rods; telescopic states of the hydraulic rods are uniformly coordinated through a hydraulic rod controller, and transmission of the transmission mechanism is completed by transmission of a series of gears; and the transmission mechanism is high in efficiency and environmental friendly.