The invention relates to a preparation method of a self-lubrication material nanometer calcium fluoride for a ceramic cutting tool. The preparation method comprises the following steps: (1) weighing calcium nitrate and ammonium fluoride, respectively placing in a beaker, adding distilled water and anhydrous ethanol, to obtain a calcium nitrate liquid with content of calcium nitrate being 1mol / l, and an ammonium fluoride liquid with content of ammonium fluoride being 2.2-3.2mol / l; (2) weighing a certain amount of polyethylene glycol (PEG6000) dispersing agent with molecular weight of 6000, adding the ammonium fluoride liquid so that the mass fraction of the polyethylene glycol in the liquid is 1-2%; performing ultrasonic dispersion for 10-15min, thoroughly dissolving, to obtain a polyethylene glycol-ammonium fluoride complex liquid; and (3) placing the polyethylene glycol-ammonium fluoride complex liquid into a magnetic stirrer, setting the reaction temperature of 15-50DEG C, dropping the calcium nitrate liquid in the polyethylene glycol-ammonium fluoride complex liquid through a separating funnel, appropriately adjusting the speed to be close to flow-in speed (drop-in speed is 1-30ml / min), wherein the stirring frequency under which no liquid is splashed is the best. The prepared nanometer calcium fluoride powder is high in purity, complete in crystal form, high in crystal degree, uniform in size distribution, and good in dispersity.