Still kettle

The utility model belongs to the field of silicate processing devices, and discloses a still kettle. The still kettle comprises a kettle body, a kettle cover matching with the kettle body and a support; the kettle body comprises a barrel body and a kettle body flange; the kettle cover comprises a spherical crown seal head and a kettle cover flange; the surface, in contact with the kettle cover flange, of the kettle body flange is provided with a first row of teeth, and a groove is formed between each two adjacent teeth; the surface, in contact with the kettle body flange, of the kettle cover flange is provided with a second row of teeth, and a groove is formed between each two adjacent teeth; the first row of teeth and the second row of teeth are meshed; arc-shaped recesses are formed at the positions where the teeth roots of the first row of teeth and/or the second row of teeth are. The structure of the still kettle can meet intensity requirements and has certain fatigue life; the fatigue life of the structure is enabled to be longest, repairing expense can be reduced, and repairing efficiency is increased.