A horizontal airflow drying system comprises a hot airflow system (1), a feeding device (3), a horizontal airflow drying pipe (4), a dry material separation device (5) and a tail gas exhaust device (6), wherein the hot airflow system is used for generating hot airflow needed by drying, the feeding device is used for feeding wet materials, the horizontal airflow drying pipe is used for conducting flow mixing and heat exchange on the hot airflow and the wet materials to dry the wet materials, the dry material separation device is used for separating the dry materials from mixed flow, and the tail gas exhaust device is used for exhausting tail gas after the dry materials are separated. The hot airflow system (1) and the feeding device (3) are both directly or indirectly connected with the horizontal airflow drying pipe (4), and the horizontal airflow drying pipe (4) is directly or indirectly connected with the dry material separation device (5) and the tail gas exhaust device (6) sequentially and is horizontally or obliquely installed. The horizontal airflow drying system is low in energy consumption and cost, fewer in required devices, low in discharging temperature, and high in drying efficiency and reliability.