The invention provides a wide-area multi-stage distributed parallel power grid analysis system. The wide-area multi-stage distributed parallel power grid analysis system comprises a client-side server, a work server, a supervisor server, an auxiliary supervisor server and a task server, wherein the work server analyzes a power grid analysis task initiated by the client-side server and allocates the power grid analysis task to the supervisor server or the auxiliary supervisor server or the task server to undergo wide-area multi-stage distributed parallel calculation. Compared with the prior art, the wide-area multi-stage distributed parallel power grid analysis system has the advantages that the distributed calculation technology and the parallel calculation technology are adopted, global shared data provided by a scheduling cloud platform are fully used, and the calculation accuracy of online analysis of a large power grid is improved.