Abstract: The glass fiber reinforced composite plastic (GFRP) was used as the test material, according to the experimental design of the cutting speed (251.2, 301.44, 351.68, 401.92, 452.16 m/min) and feed rate (0.1, 0.2, 0.3, 0.4, 0.5 m/min), a carbide tool was selected to carry out milling test on GFRP, and the effects of cutting speed and feed rate on milling force, milling temperature and surface roughness were studied, and the surface damage mechanism of GFRP was investigated by scanning electron microscopy. The results show that the milling force and surface roughness decrease when the cutting speed increases, while the milling temperature increases gradually; the milling force, milling temperature and surface roughness increase gradually when the feed rate increases. The mean value analysis concludes that the influence of feed rate on milling force, milling temperature and surface roughness is greater than the spindle speed. The surface damage of GFRP is mainly in the form of resin damage and fiber damage.