Flame-retardant plant fiber construction heat-insulation wall material and preparation method thereof

The invention discloses a method for preparing a flame-retardant plant fiber construction heat-insulation wall material. Bamboo, wood and crop straw are taken as raw materials, and the method comprises the following steps of: performing softening treatment, fiber separation, pulp concentration, fiber fibrillation, enhancement treatment, waterproof treatment and flame retardant treatment, injecting a foaming agent and foaming solution through a method for mechanically stirring to introduce air into liquid for foaming; and injecting the foamed solution into a container, dehydrating, drying and setting, sawing into plates, and performing surface coating treatment, drying and other technology so as to prepare the wall material. The method makes branch resources of wood, bosky minor-diameter bamboo, bamboo processing leftover materials and the crop straw become high-additional value high-efficiency construction heat-insulation materials.