The invention provides an intelligent optimization method for a maintenance plan with consideration of multi-constraint and multi-target conditions. According to the invention, on the basis of characteristics of an electrical network, multi-target optimization is carried out on a maintenance plan of the electrical network, wherein the optimization takes regard of economy, security and reliability, so that a maintenance plan after optimization is intelligently generated. The plan generated by the method provided in the invention enables requirements of security and stability of the electrical network to be met during the implementation of the plan.