The utility model provides a multi -functional voltage falls generating device, the device is including being used for producing a subsystem that voltage falls and being used for control and protection the secondary system of a subsystem, a subsystem includes: get ability transformer, cubical switchboard, matrix current limiting reactor group, matrix short circuit reactor group and single -phase contactor, secondary system includes monitored control system, control system, protection system and record wave system all, secondary system with the low tension side of getting the ability transformer is equipped with uninterrupted power source UPS within a definite time, get ability transformer, service entrance switch, the bypass switch, outlet switch series connection, the X1 of matrix current limiting reactor group with the bypass switch is parallelly connected, the X1 of matrix current limiting reactor group, short circuiting switch, matrix short circuit reactor group X2, single -phase contactor are established ties. The utility model provides a technical scheme circuit is realized simply, and interference suppression's can the reinforce.