The present invention relates to an autonomous hydraulic expansion and contraction apparatus, the apparatus comprising: a fixed part having a fixed support member at the bottom end thereof a cylinder part attached on top of the fixed part and having an accommodation space in the interior for storing oil a support part moving up and down in accordance with the movement of the oil stored in the accommodation space, the support part having one side thereof inserted in and attached to the accommodation space of the cylinder part and the opposite side located on the outside and having an expansion and contraction fixed member at the end thereof a piston part attached to the end of the support part, inserted into the accommodation space, to operate in concert therewith, and comprising a barrier-type sealing part and a valve part arranged on the outer surface of the cylinder part and having upper and lower connecting members attached thereto in open communication with the cylinder part, wherein a vertical connecting member is attached to the ends of the upper and lower connecting members, and a valve provided with a valve attachment hole, which is closed or opened to the connecting member in accordance with the manipulation of a lever, is attached at the connecting portion of the lower connecting member and vertical connecting member. According to one embodiment of the present invention, by controlling the expansion and contraction length of the support part by a simple manipulation of the valve part by moving the lever, the autonomous hydraulic expansion and contraction apparatus can be easily expanded and contracted to the combined length of the expansion and contraction equipment, and additionally, the convenience of use can be enhanced.
