At present, the high power nanosecond 532 nm laser is generally an all-solid system. But stability of the solid laser is poor, which limits the application range of nanosecond 532 nm laser. In this paper, the 532 nm laser is composed of all fiber 1 064 nm laser and spatial frequency doubling. The pulse width is 2.475 ns, the repetition frequency can be adjustable from 100 kHz to 5 000 kHz, the average power is 100.2 W@800 kHz, and the frequency doubling conversion efficiency is 77.6%. The beam quality of green light is M_x² =1.197, M_y² =1.193. The nanosecond green laser has the advantages of high beam quality, high average power, convenient flexible integration and compact structure, and can be used as an ideal light source in the fields of superhard and brittle materials processing and silicon etching.