The invention discloses a preparation method of high-strength corrugated paper board core paper. Chrysotile is taken to be put into a pulverizer to be pulverized into particulate matter, and the obtained particulate matter is placed into a reaction kettle containing ammonium persulfate and deionized water; the temperature rises to 90 DEG C to 100 DEG C, uniform stirring is carried out, the temperature is kept for 20 minutes to 30 minutes, and a mixture is obtained; and the mixture is put into an extrusion device and is heated and compressed to be in a molten state, the molten mixture is injected into an inclined corrugated mold, a cutter and a conveying belt are arranged on a mold outlet, an obtained cut corrugated paper board is conveyed to a cooling device to be cooled to 60 DEG C to 80 DEG C, and the corrugated paper board core paper is obtained. Compared with the prior art, the preparation method has the beneficial effects that after the chrysotile serves as a main material to be extruded and molded, the higher stiffness and the high ring crush compression resistance are achieved, the preparation process is simple and easy to operate, a certain degradation ability is achieved, and environmental pollutions are avoided.