The invention relates to a system and method for optimizing parallel tasks. According to the system, a dispatch server and a plurality of task submission terminals are connected through first network environment, and the dispatch server and a plurality of computational nodes are connected through second network environment; a virtual machine runs through the computational nodes, and a uniprocessor program runs on the virtual machine; the task submission terminals upload task files to the dispatch server through a first command line under the first network environment; the dispatch server dispatches the task files to one of the computational nodes under the second network environment according to the first command line and the task files, and the task files comprise data parameters; the uniprocessor program carries out processing according to the data parameters to obtain a computational result; the result is returned to the task submission terminals through the dispatch server. Therefore, parallel processing is carried out on the tasks through the dispatch server, corresponding computation runs on the computational nodes according to the data parameters, a large number of parallel tasks are computed fast, and time consumed by computation is reduced.