Reaction kettle for producing isotretinoin and preparation method of isotretinoin

The invention discloses a reaction kettle for producing isotretinoin and a preparation method of the isotretinoin, and relates to the field of reaction kettles.The reaction kettle comprises a reaction kettle body, the reaction kettle body is provided with a reaction cavity, a driving part and a stirring rod, the stirring rod is coaxially provided with stirring blades, and the blade length of the stirring blades is increased in the direction close to the bottom of the reaction cavity; the driving piece drives the stirring rod to rotate; the reaction kettle body is provided with a feeding pipe, the feeding pipe is located at the upper end of the reaction kettle body and close to the axis of the reaction kettle body, the feeding pipe is communicated with the reaction cavity, and the end, located in the reaction cavity, of the feeding pipe faces the axis of the stirring rod; the blade length of the stirring blade is increased in the direction close to the bottom of the reaction cavity, and the end, located in the