A novel near-infrared fiber broadband laser antireflection film within 800~1300 nm band is designed,and it can apply to multi-band high-power semiconductor lasers and has high damage threshold.By selecting a suitable optical material,simulating with TFCalc software,adjusting the optimal process parameters,and using thermal evaporation vacuum coating instrument and RF ion source assisted deposition method,the problems of end face cleaning of small-diameter fibers and coating adhere strength of low temperature coating are solved.The sample spectra after coating are analyzed by Agilent CARY6000i optical measurement system.The results show that the average transmission of this antireflection film is 99.2% within the range of 800～1300 nm.Taking single tube 808 nm,980nm and 1064 nm semiconductor lasers as the light source respectively,the output power of multimode fiber after coating has improved significantly.This film can effectively improve the coupling efficiency of high-power semiconductor laser and optical fiber,and has good application values.