The invention discloses a laser holographic ultramicron silver salt photosensitive material and a preparation method thereof, and relates to the technical field of silver salt photosensitive materials. The material is prepared from distilled water, gelatin, benzotriazole, potassium chromium sulfate dodecahydrate, metronidazole, silver nitrate, citric acid, p-tert-butylphenol, sodium benzenesulfinate, potassium bromide, magnesium chloride, disodium ethylene diamine tetraacetate, nitrophenylhydrazine, sodium sulfonate, phenol, formamide, thymol, methanol and ethanol. The laser holographic ultramicron silver salt photosensitive material provided by the invention has excellent performances of low noise, high resolution, high sensitivity and high transparency, is sensitive to red light spectral line wavelength of 630 nm, green light spectral line wavelength of 545 nm and blue light spectral line wavelength of 450 nm, and has the sensitivity of 10-20 [mu]J / em<2>.