The first experimental measurements of the threshold energy density values for the laser ablation of glass nanocomposites with nanodimensional coatings have been carried out under the action of the YAG-Nd laser power pulse radiation. The coatings in question were of different composition and had been created by the sol-gel technology. The procedure for determination of the laser ablation threshold energy density values was worked out on the base of the breakdown probability level of 0.5. The statistical processing of measurement data over all the samples allowed to obtain the relationship of the ablation destruction threshold energy parameters to the coatings physical and chemical properties such as a pulse duration of laser radiation, the sample transmission in visible region of the spectrum, a coating thickness and a chemical composition of film-forming solution.