The invention discloses a stirring device for a gas-liquid mixing reactor. The stirring device for the gas-liquid mixing reactor comprises a support seat, wherein stirring paddles and a motor for driving the stirring paddles are installed on the support seat, each stirring paddle comprises a hollow shaft rotatably installed on the support seat, and a plurality of air vents are formed in the hollow shaft; the stirring device further comprises a belt wheel fixed at the top of the hollow shaft and linked with a motor, a pipeline rotary joint installed at the top end of the hollow shaft and communicated with the interior of the hollow shaft, and a plurality of stirring fins fixed on the outer wall of the hollow shaft. According to the stirring device for the gas-liquid mixing reactor disclosed by the invention, during stirring, the stirring paddles release air and generate air bubbles, large air bubbles are crushed into small air bubbles under the beating of the stirring fins, the small air bubbles easily stay in a liquid for further gas-liquid mixing, and the small air bubbles can easily diffuse to various parts under the action of the stirring fins.