The utility model relates to a mineral sampling and uniformly-mixing machine comprising an outer cylinder body, an inner cylinder body, a rack and a motor, wherein a feed port is formed in the upper end of the outer cylinder body; a discharge port is formed in the lower end of the outer cylinder body; the inner cylinder body is arranged inside the outer cylinder body and is connected with the motor through a rotating shaft; and a stirring sheet is arranged on the outer wall of the inner cylinder body. The inner cylinder body is driven to rotate by the motor, and materials enter a hollow cavity between the outer cylinder body and the inner cylinder body from the feed port and are continuously and uniformly mixed under the stirring action of the stirring sheet on the outer wall of the inner cylinder body so as to achieve a high mixing degree. When the mineral sampling and uniformly-mixing machine is mounted, an inclining angle of 5-10 degrees is formed between a center line of the cylinder body and the ground, the discharge port is located at the lower part, and scattered materials can flow out from the discharge port on an inclining surface by virtue of the gravity to realize a continuous working mode of feeding, uniform mixing and discharging synchronously. The materials can be uniformly mixed by the mineral sampling and uniformly-mixing machine instead of a manual coning method, the high mixing degree can be achieved, the time and the labor are saved, the work efficiency is improved, and the material loss is also reduced.