The 1×2 all-fiber magneto-optic switch with the novel optical route is studied for the all-optical networking, by means of the magneto-optic crystal film, the half-wave plate, the polarized beam splitter, the polarized beam combiner, and the high-speed Faraday rotator etc. Some nanosecond pulse generators are designed and fabricated by the avalanche dynatrons, in order to actuate the miniature solenoid in the Faraday rotator. The dimensions and structure layout of the solenoid are designed optimally, while the magnetic field intensity and the self-inductance coefficient are analyzed to enhance the switching-speed of the magneto-optic switch. The performance measurement results state that the rising-time of the nanosecond pulse is 2~5 ns, the pulse width is 6~12 ns, and the pulse amplitude is 30~150 V. For the all-fiber magneto-optic switch, the insertion loss is 1.55 dB, the crosstalk is 23.69 dB, the extinction ratio is -23.69 dB, and the switching-time is 100~400 ns. The switching-time of the all-fiber magneto-optic switch has reached the nanosecond level.