A novel micro high-speed 1×2 magneto-optic switch,which is used in high-speed all-optical communication network,is designed and analyzed. The study of micro high-speed magneto-optic switch mainly involves the optical route and high-speed control technique design. Nanosecond pulsed current transients from nanosecond impulser are used to switch the magnetization of the magneto-optic crystal,which propagates a 1550nm optical beam. The electronic circuits of nanosecond impulser and the pulsed magnetic field design schemes are both simulated on computer and tested by the experiments respectively.The experiment results state that the nanosecond impulser can output the pulse,with rising edge time 1.3～3.2 ns,voltage amplitude 10～90 V and pulse width 4～100 ns. Under the control of MCU singlechip,the optical beam can be stably switched and the switching time is less than 1μs currently.