The utility model relates to a bus reactive power optimization compensation controller, belonging to the field of power equipment. The bus reactive power optimization compensation controller comprises a bus, a capacitor set and a magnetic control reactor set, wherein the capacitor set is arranged in parallel with the bus, and the magnetic control reactor set is arranged corresponding to the capacitor set and is connected with the bus. The bus reactive power optimization compensation controller is characterized in that the capacitor set is connected with the bus through a fling-cut switch, and the magnetic control reactor set is respectively connected with all capacitors of the capacitor set through a controller. The bus reactive power optimization compensation controller has a simple and effective structure, is strong in computing capacity of a processing device, is used for carrying out capacitive reactive compensation on the selected capacitor set needing being put into use and carrying out inductive reactive compensation through the magnetic control reactor set according to actual conditions after figuring out a numerical value needing reactive power compensation, can realize reactive power compensation on the bus without configuring the magnetic control reactor set with a capacitor equal to that of a fixed capacitor set, and has the advantages of low cost and high automation degree.