The invention discloses a washing and selecting mixing tank which comprises a washing and selecting tank body, a stirring shaft and anchor chains. The penetrating stirring shaft is horizontally arranged in the washing and selecting tank body. Stirring teeth which are arranged in a staggered mode are arranged on the stirring shaft. A coal inlet is arranged on the upper portion of the sidewall of the washing and selecting tank body, and a coal outlet is arranged on the lower portion of the opposite sidewall of the washing and selecting tank body. The anchor chains which are parallel to the stirring shaft are uniformly arranged on the inner wall of the washing and selecting tank body. Steel bars with both two ends fixed on the inner wall of the washing and selecting tank body and chains connected between the steel bars form the anchor chains. Each anchor chain is provided with steel hammers. The number of the anchor chains is at least four. The washing and selecting mixing tank improves the progress and washing and selecting efficiency of washing and selecting equipment, reduces waster of raw materials and is simple in structure.