The invention provides an active power distribution network source network load elastic control system. The system realizes bidirectional information interaction between a regional power distributionnetwork power dispatching center and a power terminal user and completes various demand response control targets; a power dispatching center issues a previous or real-time power dispatching command according to a historical load curve and predicted power consumption information so as to realize peak modulation or frequency modulation and voltage modulation requirements of a power grid; and a controllable load terminal receives the dispatching command, executes controls according to the dispatching command, determines a source network load elastic control strategy and controls the load on-off operation to respond to the power grid requirements. Based on an active distribution network source load friendly interactive system, the control system fully combines a large amount of external information of the main distribution network to construct the network source cooperative control system on the premise of considering the influence of different communication modes and multi-time scales ofthe main distribution network on the DG and the active load elastic response capability.