The invention discloses a husk breaking device of rice husks and a using method thereof. The husk breaking device of the rice husks comprises a feeding system, a husk breaking system and a grinding system which are sequentially connected, and the husk breaking system comprises a shell and grinding discs disposed in the shell; a discharge opening is formed in the bottom of the shell, and strip patterns are formed in the disc surface of the grinding disc; the grinding discs comprise the first grinding disc and the second grinding disc, and the first grinding disc and the second grinding disc areoppositely disposed in the shell; and the first grinding disc is fixed to the shell, the grinding system is used for driving the second grinding disc to rotate, and the feeding system is used for conveying the rice husks between the first grinding disc and the second grinding disc. The husk breaking device adopts a technical method which is completely different from a traditional rice husk processing method, only the husks of the processed rice husks are broken, the processed rice husks are not broken, weak boundary layers on the surfaces of the rice husks are removed, gluing of an adhesive is more suitable, and therefore the mechanical properties of artificial boards which use the rice husks as raw materials are improved.