The invention provides a manufacturing method of an environment-friendly energy-saving solid wood composite multilayer decoration board. At present, raw materials in industries of furniture, ornamentation, decoration and wood doors in China generally adopt solid wood boards, wedge joint boards, plywood, laminated wood boards, density boards, shaving boards and the like. The method comprises the following steps that firstly, raw wood is steamed and boiled for softening treatment, and is processed into veneers through rotary cutting, and drying is carried out; the wood textures of the veneers are divided into transverse texture arrangement and vertical texture arrangement, the veneers in transverse texture arrangement and vertical texture arrangement are arranged in a laminated 90-degree vertical crossing distribution mode, and in addition, the surfaces to be bonded are coated by glue; the ranged and glue coated veneers are placed into a hot pressing machine to be pressed into a multilayer plate, and resting preservation is carried out; square ranging is carried out, four edges are sawed away, grinding and thickness fixing are carried out by a grinding machine, and in addition, the glue is coated on the two sides; the glue is coated on a density board, the pressing is carried out by the hot pressing machine, and the grinding and the secondary thickness fixing are carried out by the grinding machine. The manufacturing method has the advantages that ordinary lumber resources are sufficiently used for replacing rare lumber resources, the goal of changing waste materials into valuable materials is achieved, the forest resources are powerfully protected, and the cost is reduced.