The invention discloses a mechanical circulation double-layer reaction kettle. A kettle body comprises an upper kettle body and a lower kettle body, and the upper kettle body and the lower kettle body are buckled with each other and are connected through hinges; a seal ring is arranged between the upper kettle body and the lower kettle body, and the upper kettle body and the lower kettle body are both of a double-layer hollow structure; an air inlet connecting mouth and an air outlet connecting mouth which are communicated with the interiors of the upper kettle body and the lower kettle body are connected with the upper kettle body and the lower kettle body respectively, and the air inlet connecting mouth and the air outlet connecting mouth are communicated with a hot oil pipe; a circulation discharging port is formed in the bottom of the kettle body, a discharging pipe inside the kettle is connected with the circulation discharging port, and one-way valves are arranged on a feeding pipe inside the kettle, the discharging pipe inside the kettle, a finished product outlet pipe and a filter inlet pipe respectively. The invention relates to the mechanical circulation double-layer reaction kettle.