The invention discloses a reaction kettle which comprises a vertical cylindrical kettle body, wherein the kettle body is provided with a kettle cover, a viewing mirror, a liquid longitudinal circulation
system, a material port, a temperature probe and the like; a cooling jacket is arranged on the outer wall of the kettle body; a stirring device is arranged in the kettle body and penetrates through the kettle top to be connected with a power device; an air-pressure sealing device is arranged outside the rotatable connection part between the stirring device and the kettle top; the stirring is divided into three
layers, wherein the three-vane propulsive stirring is performed at the bottom layer, and two-vane inclined-
paddle type stirrers are arranged on the two
layers above; annular pipes are arranged in the kettle body and connected by fin pipes; the kettle body, the kettle cover, the annular pipes and the fins are all made from 304 steel; and the outer layer is provided with the cooling jacket made from
carbon steel. Compared with the existing reaction kettle, the reaction kettle disclosed by the invention has novel design, can mix the materials more sufficiently, improves the heat exchange efficiency, reduces the manufacturing cost, and particularly obviously improves the product conversion efficiency and reaction effect in the production of
emamectin benzoate and improves the product quality.