The invention relates to an AC-DC power grid operation control method facing the energy Internet. An AC-DC power grid comprises AC systems, the DC network and converter stations, wherein each AC system is accessed to the DC network through the converter stations, the multiple AC systems are in mutual connection through the DC network, and operation capability analysis, main station switching control and multi-terminal cooperation adjustment are realized through the method. The method is advantaged in that a control main station of the DC network is determined through operation capability analysis, a control model of each converter station is rapidly adjusted through main station switching control, and a constant DC voltage and stable AC load electric power supply are guaranteed; an AC side line load of each converter station after main station switching control is balanced through multi-terminal cooperation adjustment, heavy-loading of an AC line or a transformer caused by mode switching can be avoided, power supply capability of a system is effectively improved, and wide development and application prospects are realized.