Hydraulic system used for recycling emulsified liquid of coal face

The invention discloses a hydraulic system used for recycling emulsified liquid of a coal face. The hydraulic system comprises hydraulic control units. Each hydraulic control unit comprises a hydraulic stand column, a hydraulic jack reversible lock, hydraulic equipment and a hydraulic control valve set used for controlling the hydraulic stand column, the hydraulic jack reversible lock and the hydraulic equipment, wherein a back flush emulsified liquid inlet of the hydraulic control valve set is communicated with an outlet of a back flush filter; a liquid drain outlet of the back flush filter is communicated with a liquid return pipeline through a pipeline; an inlet of the back flush filter is communicated with a high-pressure liquid inlet pipeline through a stop valve; the liquid return pipeline is communicated with an inlet of an emulsified liquid pump box through a liquid return filter; an outlet of the emulsified liquid pump box is communicated with the high-pressure liquid inlet pipeline through an emulsified liquid pump station; a back flush emulsified liquid return port of the hydraulic control valve set is communicated with the liquid return pipeline through a break valve; a diversion interface of a stand column safety valve of the hydraulic stand column and a diversion interface of a jack safety valve of the hydraulic jack reversible lock are communicated with the liquid return pipeline through pipelines.