Hydraulic control stretching locking hydro-pneumatic suspension system and chassis height adjusting method

The invention discloses a hydraulic control stretching locking hydro-pneumatic suspension system and a chassis height adjusting method, and is applied to the technical field of machinery. The system comprises a main valve block, a cylinder side valve block, a hydro-pneumatic spring assembly and a hydraulic control valve; the main valve block is connected with the cylinder side valve block through a pipeline, and the cylinder side valve block is connected with a pressure oil port of the hydro-pneumatic spring assembly through a pipeline; wherein the hydro-pneumatic spring assembly and the hydraulic control valve are designed in an integrated mode, the hydraulic system controls flowing on-off of hydraulic oil between a rod cavity and a rodless cavity of the hydro-pneumatic spring assembly through the hydraulic control valve, and normal stretching and locking functions of the hydro-pneumatic spring are achieved. According to the system, on-off can be controlled through the electromagnetic valve, and it is guaran