The invention relates to a multifunctional light energy-saving wall plate, which uses bitter salt, magnesia, modifying agent, bit plant fiber, and glass fiber material to produce surface and frame, uses rigid foam sheet to produce thermal-insulating layer, and adheres core layer and bamboo elements on the walls. Since it uses the pressure shaping drying method to produce wall, the producing efficiency can be improved 10-20 times, with lower investment and cost. Compared to present technique, the invention has light weight, non-moisture, thermal-insulation, fire-proof, noise-insulation, high strength, non-broken and non-deformation, which can apply the frame, inner and outer walls and the production of fire-proof door.