Pipeline winding and unwinding hydraulic control system and primary-secondary type drainage vehicle

The invention discloses a pipeline winding and unwinding hydraulic control system and a child-mother type drainage vehicle, the pipeline winding and unwinding hydraulic control system comprises an oil tank, an oil pumping device and a pipeline hydraulic driving device, and the oil pumping device is used for pumping out hydraulic oil in the oil tank; the pipeline hydraulic driving device comprises a reversing valve, a pressure control valve and a reel motor in driving connection with a reel wound with a hydraulic pipeline, and the reversing valve is connected with the oil pumping device, the oil tank, an unwinding working oil port of the reel motor and a winding working oil port of the reel motor and used for being switched between an unwinding driving state and a winding driving state. The pressure control valve is arranged on the working oil way where the winding working oil port is connected with the reversing valve, so that after the child car stops, the hydraulic pipeline does not have enough force to ena