The invention discloses a low-voltage reactor-considered sending end convertor station high-power fluctuation reactive control method. The low-voltage reactor-considered sending end convertor stationhigh-power fluctuation reactive control method comprises, when the reactive Qexc exchanged by an alternate current-direct current system is a negative value, filling superfluous reactive power into analternate current system through a sending end converter station, and taking into prior consideration the ability of low-voltage electric reactors on absorbing the reactive power, wherein the controlcriteria comprise that, if the Qexc is in a range of currently-fed low-voltage reactor reactive power absorbing capacity and reactive power absorbing capacity of all the applied low-voltage reactorsafter another group of low-voltage reactor is put into use, ensuring no reaction of the low-voltage reactors, if Qexc exceeds the range, applying another group of low-voltage reactors, else, cutting off a group of low-voltage reactors; if the superfluous reactive power extends the capacity of all the low-voltage reactors on absorbing the reactive power, directly cutting off a group of alternate current filters; when Qexc is not a negative value, absorbing the reactive power through the converter station, taking into prior consideration the capacity of a direct current matched power source on providing the reactive power, and controlling applying and cutting-off of the alternate current filters according to alternating voltage criteria. The low-voltage reactor-considered sending end convertor station high-power fluctuation reactive control method reduces the number of times of applying and cutting-off of the alternate current filters during high-power operation of a direct current system, and is significant to safe operation of the direct current system.