The invention belongs to the technical field of reactive voltage control of power systems and particularly relates to a multi-source coordinated control system and method capable of improving the reactive voltage control level. The method comprises the following steps of establishing a reactive voltage system of a provincial and local integrated multi-source coordinated control network; and establishing a J2EE architecture-based reactive voltage check system on the basis of the reactive voltage system of the provincial and local integrated multi-source coordinated control network. The problemof an increasing control difficulty in network voltage is solved; the influence of large-scale network connection of wind power, solar energy and other clean energy on the quality of the network voltage can be effectively reduced; large-range movement of reactive power flow is avoided; high-quality power supply of various voltage levels is ensured; and the quality of the whole network voltage is improved. The reactive voltage management system of the provincial and local integrated multi-source coordinated control network is pioneered in the country; especially the method of uniformly bringingnew energy power supply and load management into the reactive voltage management range has significant advancement; and compared with a traditional disordered voltage control mode, the multi-source coordinated control method is more reasonable, standardized and advanced.