The invention discloses a method used for preparing fluorescent hollow carbon nanoparticles via liquid phase excimer laser ablation, and belongs to the technical field of photoelectric material. According to the method, pulse excimer laser beam with a wavelength of 248nm is used for ablation of SiC powder immersed in deionized water so as to obtain amorphous hollow carbon nanoparticles dispersed in deionized water, wherein the particle size of the amorphous hollow carbon nanoparticles ranges from 20 to 30nm. The amorphous hollow carbon nanoparticles possess excellent fluorescence characteristics, strong and stable purple-blue light emission is induced under ultraviolet excitation, and application prospect in the fields including optoelectronics research field and biomedicine field is promising.