The invention discloses an intelligent switching device of a paralleling reactor. The intelligent switching device comprises a bus, a three-phase electric linkage SF6 breaker connected with the bus, the paralleling reactor connected with the three-phase electric linkage SF6 breaker and an intelligent phase selecting device. A current transformer is connected between the three-phase electric linkage SF6 breaker and the bus in series. A secondary circuit of the current transformer is connected with the intelligent phase selecting device. The bus is provided with a voltage transformer. A secondary circuit of the voltage transformer is connected with the intelligent phase selecting device. A switching method comprises the steps that the three-phase electric linkage SF6 breaker runs normally, the intelligent phase selecting device detects a voltage signal of the voltage transformer after receiving switching-off instructions, the intelligent phase selecting device sends the switching-off instructions according to the set time delay, and just-separated points of contacts of all phases of the three-phase electric linkage SF6 breaker are controlled to be at the voltage 90-degree position. The intelligent switching device has the advantages that intelligent control over the breaker switching-off process is achieved, and it is guaranteed that insulation strength of fractures is large enough to resist the strength of a recovery voltage when all the phases of the breaker quench arcs.