Hydraulic lifting column is one of the mini-hydraulic system built body lifting column, the system is a small, high-torque motor via a connecting block with an integrated valve gear pump and tank parts, then a complete miniature hydraulic cylinder assembly and integration system. Complete energy - mechanical energy - hydraulic energy - mechanical energy conversion process complete, truly micro electromechanical, hydraulic integration of the system, then the hydraulic system was installed in the body by lifting column structural components, each lifting column is a separate unit compared to the use of a central hydraulic power station drive and electromechanical drive, has the following advantages: 1, without laying underground hydraulic lines, simple installation and low construction costs. 2, because there is no laying underground hydraulic lines, the maintenance problems only need to be cylindrical, internal zero can easily remove the whole group fittings for easy maintenance and repair.