The invention provides a multifunctional analysis high-pressure reaction kettle and an application method thereof, and belongs to the field of pressure leaching reaction system experiments and analysis equipment. The multifunctional analysis high-pressure reaction kettle comprises a high-pressure reaction kettle, a microwave-proof protection cover, a photographing device, an illumination device and a potential measurement device; the multifunctional analysis high-pressure reaction kettle is further provided with a high-pressure reaction kettle controller, a stirring paddle, a stirring shaft, a motor, a speed measuring lead wire, a thermocouple, a charging funnel, a charging tank, a discharging guide pipe, a discharging hole, a pressure meter and a gas bottle. The high-pressure reaction kettle can be heated by microwaves, and has visualized observation and potential analysis determination functions; the invention provides a comprehensive measurement method. The high-pressure reaction kettle is simple in structure and convenient to operate; observation of a behavior rule of air bubbles in the kettle and determination of the potential of a reaction system can be very easily realized through a high-speed camera under a microwave heating condition in the high-pressure reaction kettle, and an electron transferring condition of main reactants in a reaction process is judged.