Multi-kettle series-connection gas-liquid countercurrent continuous reaction device

The utility model discloses a multi-kettle series connection gas-liquid countercurrent continuous reaction device which comprises at least two reaction kettles which are arranged in series connection, and liquid phase feed ports of the reaction kettles are higher than liquid phase overflow ports. The liquid-phase feed port of the next-stage reaction kettle is connected with the liquid-phase overflow port of the previous-stage reaction kettle, and the liquid-phase feed port of the first-stage reaction kettle is connected with a material pipeline. A liquid-phase material sequentially flows through all stages of reaction kettles from the first stage. The reaction kettle is further provided with an air inlet and an air outlet, the air outlet of the next-stage reaction kettle is connected with the air inlet of the previous-stage reaction kettle, the air inlet of the last-stage reaction kettle is connected with a raw material air pipe, and a self-suction stirring mechanism is arranged in the reaction kettle and is