Main winch control system for rotary drilling rig and rotary drilling rig

The invention relates to the technical field of engineering vehicles and discloses a main winch control system for a rotary drilling rig and the rotary drilling rig. The main winch control system for the rotary drilling rig comprises a main winch driving hydraulic loop, a potential energy recycling system, a rotating speed sensor and a control device, wherein a main winch driving hydraulic system drives a drill rod to rotate by a driving motor; the potential energy recycling system comprises a variable motor and a flywheel; by controlling the communication direction between the driving motor and the variable motor, the control device realizes an effect of enabling the flywheel to store energy when being positioned below the drill rod and enabling the flywheel to do work when the drill rod ascends. According to the technical scheme, potential energy generated when the drill rod descends is stored by adopting the flywheel and when the drill rod ascends, and the potential energy stored by the flywheel is released, so that energy consumption of the rotary drilling rig is reduced and energy is saved.