Connecting device for earth kiln smoke flue

The utility model relates to a smoke flue connecting device, in particular to a connecting device for an earth kiln smoke flue. The connecting device for the earth kiln smoke flue comprises the smoke flue arranged at the top end of a kiln and a smoke pipe. The smoke flue comprises a smoke flue body, a lower connecting groove in a circular groove shape, and a sealing medium contained in the lower connecting groove, and the lower connecting groove is formed in the outer wall of the top end of the smoke flue body. The smoke pipe comprises a smoke pipe body and an upper connecting groove fixed to the outer wall of an opening of the smoke pipe body. The diameter of the upper connecting groove is greater than that of the smoke flue body but smaller than that of the lower connecting groove. When the connecting device is used, people only need to plug the upper connecting groove of the smoke pipe into the lower connecting groove of the smoke flue, the sealing medium in the lower connecting groove can well play the ro