The invention provides a method and a device for controlling fertilizer distribution. The method for controlling the fertilizer distribution comprises the following steps: sequentially unloading fertilizer raw-materials in two or more storage bins into a weighing bin, and carrying out weighing according to preset weight ratio, wherein each storage bin contains one kind of fertilizer raw-material; transferring the weighed fertilizer raw-materials into a stirring bin, and carrying out stirring; and then, discharging the stirred final product of the fertilizer into a delivery bin. The method and the device for controlling the fertilizer distribution provided by the invention automatically control a fertilizer distribution machine to carry out the technological processes of unloading, weighing, stirring and discharging, so that no manual participation is required; thus, the production efficiency of formula fertilizers is greatly improved.