It may be portable that installing the generating device of high pressure water and water jet nozzle on the movable frame.In order to meet the safety operation of the water cutting machine in mine,it was required the machine was used without electric spark,the reversing valve in the high pressure water generating device was controlled by liquid power.Hydraulic control system which was composed of liquid controlled reversing valve,pole plunger valve and decompress circuit controlled the double acting pressurized cylinder reciprocating motion,so the continuous and stable high pressure water was produced,and the possibility of generating electric spark in electric control system was avoided.