Automatic mixing and batching stock bin

The bin comprises an outer bin body and a mixing bin, a plurality of first supporting legs are arranged on one side of the lower portion of the outer bin body, a bin cover is arranged on the upper portion of the outer bin body, a feeding pipe is arranged on the upper portion of the bin cover, a plurality of branch chambers are arranged in the outer bin body, a hopper is arranged on one side of thelower portion of each branch chamber, and the lower ends of the hoppers are connected with discharging branch pipes. A first unloading valve is arranged at the lower end of the discharging branch pipe, the lower end of the first unloading valve is communicated with the mixing bin through a connecting pipe, a discharging main pipe is arranged on one side of the lower portion of the mixing bin, anda second unloading valve is arranged on the discharging main pipe; materials of different batches enter different branch chambers through the feeding pipes. The multiple sets of inner barrels are arranged in the outer bin bod