The invention provides a combined extrusion coupling homogenization dehydration method, and belongs to the technical field of drying methods. The method comprises the following steps: grinding grains,sieving, and drying to obtain grain powder; Carrying out twin-screw extrusion treatment on the grain powder; establishment of dynamic model, Starting fluidized bed device, adjusting device parameters, after the set parameter conditions of the fluidized bed are stable; the screen is placed in a fluidized bed to be fixed, the materials are flatly laid in the screen to be dried, the inlet air temperature, the drying air speed, the water adding amount and the drying time are substituted into a kinetic model formula, the moisture ratio MR is obtained, the dry basis moisture content is determined,the drying time of the materials in the fluidized bed is determined according to the national standard requirement, and material homogenizing dehydration is achieved; and putting the dried materials on an oven conveyor belt, and performing secondary puffing treatment to obtain the final product. By establishing the dynamic model, the drying rate and the material moisture content of the fluidized bed under different process conditions at different moments can be predicted to accurately control the fluidized bed, so that the purpose of homogenizing dehydration is achieved.