Winch pressurization control device and control method therefor, and rotary drilling rig

Disclosed are a winch pressurization control device and a control method therefor, and a rotary drilling rig, which relate to the field of engineering machinery control. The winch pressurization control device comprises a pressurizing winch pressure switch (7), a sensor (8), a controller (9), a pressurization control electromagnetic valve (10) and a pressurizing winch braking electromagnetic valve (11). The winch pressurization control device can stop the pressurization of the pressurizing winch when winch pressurization is abnormal, which can avoid the structural damage to the rig and improve the safety and liability of the construction of the winch pressurization model.