The utility model provides a pair of distribution network automatic control device, once load switch concatenates on the primary circuit, the last secondary load switch that has concatenated of secondary circuit, be connected with the primary current detector on the primary circuit, be connected with the secondary current detector on secondary circuit, the primary circuit passes through the primary voltage mutual -inductor and supplies power to the primary current detector, secondary circuit passes through the secondary voltage mutual -inductor and supplies power to the secondary current detector, load switch and secondary load switch control work by power distribution controller, this scheme is for prior art, power distribution controller is according to the primary circuit, the last electric current of secondary circuit carries out corresponding control to primary circuit or secondary circuit, the distribution network can automatic control at operation in -process power distributioncontroller, thereby technical staff's intensity of labour has been reduced, furthermore, the stability of join in marriage the power grid operation in -process is improved the ability.