Hydraulic cylinder prevents leaking device and hydraulic cylinder

The utility model relates to a hydraulic cylinder prevents leaking device and hydraulic cylinder, wherein, hydraulic cylinder prevents leaking the device and is provided on the hydraulic cylinder, and it includes the hydraulically controlled check valve, and the hydraulically controlled check valve is established ties and ally oneself with the oil circuit outside hydraulic cylinder's no pole chamber, and the oil -out of hydraulically controlled check valve communicates with each other with hydraulic cylinder's no pole chamber. Hydraulic cylinder prevents leaking the device and passes through the no pole chamber series connection one hydraulically controlled check valve at hydraulic cylinder, and when hydraulic cylinder's no pole chamber needed the oil feed, oil inlet and oil -out entering hydraulic cylinder that hydraulic oil looped through the hydraulically controlled check valve did not have the pole chamber, when hydraulic cylinder need prevent leaking, the pressure of no pole intracavity storage fluid killed the hydraulically controlled check valve case, guarantees that no pole intracavity fluid does not leak, and the introduction of hydraulically controlled check valve has improved the reliability that no pole chamber fluid locked. The hydraulic cylinder prevents leaking the device and is particularly useful for inner chamber oil charge style piston rod hydraulic cylinder.