The utility model discloses a magnetic valve type controllable reactor. The magnetic valve type controllable reactor comprises an outer insulating cylinder, wherein the upper end of the outer insulating cylinder is provided with an upper end cover part, and the lower end of the outer insulating cylinder is connected with a lower end cover part; the upper end cover part comprises a reactor high voltage terminal and an upper end cover; the lower end cover part comprises a reactor low voltage terminal, a pulse control line terminal and a lower end cover; the inner surface of the lower end cover is fixedly provided with a reactor main body; a reactor main winding is connected with the reactor high voltage terminal and the reactor low voltage terminal respectively; the upper end of a reactor iron core is provided with an insulating support; the insulating support is provided with a thyristor component and a pulse transformer; the thyristor component is connected with the pulse transformer; and the pulse transformer is connected with the pulse control line terminal. The magnetic valve type controllable reactor has the advantages that: the magnetic valve type controllable reactor has simple manufacturing process, low cost, low loss, small harmonic waves and wide voltage application range and has greater application potential for improving power transmission capacity of power grids, regulating the voltage of the power grids, compensating reactive power and limiting over-voltage.