The invention discloses a bipartite graph optimal matching method for material inventory balance under complex conditions. On the basis of the weight of the inventory relation among warehouses, an inventory grade configuration table, inventory material lists in the warehouses and material demand plan lists, weighing calculation is conducted according to the optimized bipartite graph optimal matching algorithm to obtain a certain material demand plan needs what inventory material data for matching, the optimal inventory material network relation graph is obtained, and then perfect matching of material inventory balance is achieved. By means of the method, large enterprises with warehouses distributed in many regions can reasonably dispatch and distribute inventory material resources, the problems about reasonable distribution and utilization of the existing inventory material resources are solved, the material demand purchasing cost is greatly reduced, and benefits of the enterprises are maximized.