The optimal allocation of labor is of great significance to improve the efficiency of equipment manufacturing. For the shortcoming of traditional Hungary algorithm could not solve the resource scheduling problem with parallel links, an improved Hungary algorithm was proposed. The improved algorithm converted the problem into a typical assignment problem by replacing parallel link jobs with virtual jobs, and optimized it with classical Hungary algorithm and determined the realizability of the virtual jobs based on the results. Finally, the optimal scheme was obtained through iterative searching. In addition, an example of multi-skilled labor allocation system is introduced to verify the effectiveness of the proposed algorithm.