The invention discloses a superconducting controlled reactor containing a pulse width modulation (PWM) power control unit. In the superconducting controlled reactor, a primary superconducting main coil (2), a secondary PWM superconducting control winding c (5), a secondary superconducting control winding b (4) and a secondary superconducting control winding a (3) are sequentially wound on the same iron core (1) from inside to outside, and the primary superconducting main coil (2), the secondary PWM superconducting control winding c (5), the secondary superconducting control winding b (4) and the secondary superconducting control winding a (3) are independent of each other. By the reactor, a reactance value can be adjusted more accurately and finely in a smaller range by adjusting the output power of the PWM power control unit of the windings. Therefore, the combination of coarse adjustment and fine adjustment of the reactance value can be realized, and the reactance value of an access line can be adjusted more effectively.