The utility model relates to a section of thick bamboo valve straight -cylinder servomotor position feedback device, including installing sealing flange and the piston rod on the servomotor rear end cap, the piston rod is connected with the sealing flange movablely, the through -hole that the one end of piston rod stretched into on the servomotor rear end cap gets into in the section of thick bamboo valve straight -cylinder servomotor, the other end of piston rod passes the sealing flange and contacts with the feedback pole, feedback pole overcoat has the spring, the spring is provided with spring application mechanism outward, the feedback pole stretches out one section distance outside the spring application mechanism. The utility model discloses the significantly reduced fault rate of device spare part sets up the sealed movive seals such as ring, O type sealing washer that keep off between feedback pole and hydraulic system, can guarantee to feed back the pole and still can guarantee to seal reliably the effect in activity from top to bottom.