The invention belongs to the technical field of operation power distribution and voltage regulation of a power distribution network, and especially relates to a distributed flexible voltage-regulationcontrol system for a power distribution network. The system provided by the invention can guarantee the qualified rate of the voltage of a user terminal, and improves the power supply quality. The system comprises a power frequency double-splitting transformer, a first double buck/boost AC-AC converter module, a second double buck/boost AC-AC converter module, an inductor L, a capacitor C, a DSP,and a bypass switch S. The structural main points of the system are that a first secondary side of the power frequency double-splitting transformer is connected with the input end of the first doublebuck/boost AC-AC converter module, and a second secondary side of the power frequency double-splitting transformer is connected with the input end of the second double buck/boost AC-AC converter module; one output end of the first double buck/boost AC-AC converter module is connected with one end of the capacitor C and one end of the bypass switch S through the inductor L.