The invention discloses a grinding and stirring device for molten steel heat preservation covering agent production. The device comprises a grinding bucket, the top end of the grinding bucket is provided with a feeding opening, a discharging opening is formed in the center of the bottom of the grinding bucket, a support is arranged on the grinding bucket, a rotating motor and multiple feeding pipes are arranged on the support, the rotating motor is arranged on the center of the support, the rotating motor is located on the center of the upper portion of the grinding bucket, an output shaft ofthe rotating motor is downward and is connected with a grinding column through a coupler, the grinding column is sleeved with the grinding bucket, a containing cavity is formed in the top of the grinding column, a cone body is arranged in the containing cavity, multiple through holes are formed in the side wall of the containing cavity densely, and spiral grinding grooves are formed in the positions, corresponding to the through holes, of the outer side wall and the bottom of the grinding column.