The invention discloses a stepless regulation constant tension device for a hydraulic
winch, consisting of a power pump set, a
reversing valve, a
hydraulic motor, a
winch, a one-way valve, a balance valve and a motor
safety valve, wherein the power pump set is connected with an oil inlet of the
reversing valve; a first oil exchange port of the
reversing valve is connected with an oil return port of the balance valve; an oil inlet of the balance valve is connected with a
rope folding side oil port of the
hydraulic motor; a
rope release side oil port of the
hydraulic motor is connected with a second oil reversing port of the reversing valve; an oil outlet of the reversing valve is connected with an
oil tank; a control port of the balance valve is connected with an oil path between the
rope release side oil port of the hydraulic motor and the reversing valve; the one-way valve is connected between the oil inlet and the oil return port of the balance valve in parallel; the motor
safety valve is connected between the rope folding side oil port and the rope release side oil port of the hydraulic motor in parallel; and the
winch is connected with the hydraulic motor. The device achieves the function of keeping the tension of a steel
wire rope constant when the hydraulic winch is positioned under various work conditions and can be used for carrying out remote on-line adjustment on theoutput capacity of the hydraulic winch. The stepless regulation constant tension device has the advantages of simple structure, low cost, convenience for use and high safety.