The invention discloses a method for the operation task allocation decoupling of stacker-reclaimers based on a large-scale bulk cargo stock ground stack, and the method comprises the following steps: determining related regions; taking the related regions as objects, and calculating the sum of the on-duty maximum operating rates of all stacker-reclaimers in each related region; calculating the sum of the maximum operating rates of all stacker-reclaimers on each rail; calculating the on-duty mean operating intensity of each related region; calculating the on-duty operating intensity of each material strip; building a model, obtaining an operation task allocation scheme of each stacker-reclaimer, and carrying out the operation task allocation of the stacker-reclaimers. On the basis of fully analyzing the time and space distribution characteristics of material supply and unloading tasks, the method takes all stacker-reclaimer sets on the same rail as the object, and scientifically and efficiently calculates the allocation proportion of the total operating capability of all stacker-reclaimers in each stacker-reclaimer set on two material strips in a set operating range. Based on the above, the method quickly obtains an operation task allocation scheme of all stacker-reclaimers.