The utility model discloses a mixing conveying system for coal economizer and denitration part cinder and electric ash removing part fine ash. The mixing conveying system comprises a fine ash sender, a cinder sender, a conveying pipeline, a compressed air storage tank and a system control unit, wherein the compressed air storage tank is respectively connected with the fine ash sender and the cinder sender through pipelines, the fine ash sender and the cinder sender are respectively connected with the conveying pipeline through pipelines, and the fine ash sender, the cinder sender, a fine ash conveying unit control valve, a cinder control unit control valve and two compressed air control valves are connected with the system control unit. The mixing conveying system is mounted under an electric ash remover, a coal economizer, a denitration ash bucket and on an ash conveying pipeline. By reasonable air amount allocation, mixing conveying time nodes are controlled, conveying speed is lowered, pipeline abrasion and air consumption are reduced. By the mixing conveying system, investment and system operation cost can be reduced, and equipment operation efficiency can be increased.