The new type of lithium iron phosphate production line is a special production line system integrating high-temperature nitrogen protection airflow crushing and drying system. High-temperature dry gas is used to superfine pulverize lithium iron phosphate as the cathode material of lithium battery. At the same time, supersonic airflow rotary jet flow field is used to conduct heat and mass transfer and instant drying of water on the surface of the material, thus realizing the integration of superfine pulverization and micro-moisture drying of potassium iron phosphate, it can be realized that when the feed moisture is 3000PPM and the feed particle size is 150-20-30um, after crushing and drying, the finished product particle size is 150-0.6-20m,d100-410um, and the finished product moisture is 200-500ppm.