The invention relates to a hydraulic winch driving mechanism of a crane. The hydraulic type winch driving mechanism mainly comprises hydraulic motors, speed reducers, a rotary rolling disc, a windingdrum and a structural frame of the winding drum, a bearing seat support and a hydraulic control system. According to the hydraulic winch driving mechanism, the plurality of sets of hydraulic motors and speed reducers are adopted for driving, and small gears of the speed reducers are meshed with a large gear ring of the rotary rolling disc to transfer torque; each group of the speed reducer and thehydraulic motor serves as a driving unit, and the plurality of driving units are uniformly distributed on the circumference of the large gear ring of the rotary rolling disc; a standby unit can be additionally arranged through the driving mechanism, and the driving mechanism has the advantage that when a certain unit breaks down, the fault unit is removed firstly, and a new driving unit can be intervened; and the driving units are controlled by a control valve, and intelligent switching can be realized according to the form of the fault; and the hydraulic control winch driving mechanism has redundant design.