The invention provides an over-voltage protection method achieved by the adoption of a dry-type air-core shunt reactor combined over-voltage protection circuit and belongs to the field of reactor over-voltage protection. The problems that an existing dry-type air-core shunt reactor combined over-voltage protection device recrudesces and is poor in over-voltage protection effect are solved. The cut-off current over-voltage protection is performed as follows, when a switch K of a circuit breaker is cut-off, cut-off current over-voltage occurs, i0 is set as a power frequency cut-off current value, U0 is set as a reactor power frequency voltage peak value, when t=0, the circuit breaker generates cut-off current, a resistance-capacitance protection device works, when the voltage on a protection device absorption capacitor C is not larger than the residual voltage of a lightning arrester, the resistance-capacitance protection device directly completes the cut-off current over-voltage protection on the reactor, when t=t0, the voltage on the protection device absorption capacitor C is larger than the residual voltage U1 of the lightning arrester, the lightning arrester makes action, when t=t1, the voltage on the protection device absorption capacitor C is less than or equal to the residual voltage U1 of the lightning arrester, the lightning arrester exits action, and the resistance-capacitance protection device continues to complete the cut-off current over-voltage protection on the reactor. The over-voltage protection method achieved by the adoption of the dry-type air-core shunt reactor combined over-voltage protection circuit is mainly used for reactors.