The invention discloses a high-concentration large-scale ore pulp mixing stirred tank. A stirring mechanism is mounted on a tank body (9), and a steady flow plate (12) is arranged on the inner side wall of the tank body (9); a mine pipe (8) is arranged in the middle of the tank body (9); the stirring mechanism comprises a stirring shaft (6), two wheel hubs (16), an upper impeller (7) and a lower impeller (17); the upper impeller (7) and the lower impeller (17) are correspondingly mounted on the stirring shaft (6) through the wheel hubs; the upper impeller (7) is arranged on the middle upper part of the tank body (9), and the lower impeller (17) is arranged on the middle lower part of the tank body (9); the discharge capacity of the lower impeller (17) is larger than or equal to the discharge capacity of the upper impeller (7) plus the ore pulp flow capacity; and a coarse sand discharge system is arranged on the lower part of the side wall of the tank body (9) and discharges coarse grained minerals. The high-concentration large-scale ore pulp mixing stirred tank is used for mixing sizing mixing stirring of metallurgy and mining mineral processing flotation reagents and ore pulp, thereagents are fast and evenly dispersed into the high-concentration ore pulp, the stirring energy consumption is low, the service lives of blades are long, and the high-concentration large-scale ore pulp mixing stirred tank is suitable for pulp mixing stirring of high-concentration ore pulps such as rare earth ores, titanic iron ores and copper slag.