The invention relates to a production method and manufacturing technology (attached drawings) for a moulded board from corn stalk serving as raw materials, and mainly solves the problems of energy consumption, three wastes, density, internal bond strength, expansion ratio and formaldehyde release in the prior art. The method is mainly characterized by comprising the following steps of: crushing the raw materials twice to achieve the grain diameter of 1 to 15 mm and the moisture content of 15 percent or below, and determining the apparent density of the raw materials to between 0.09 and 0.13 g / cm<3> after three kinds of size grading; determining the finished product density to between 0.4 and 0.55 g / cm<3> by contrasting the density of wood; solving the compression ratio of 2.5 to 4.5 by using the ratio of two densities; stirring 70 to 80 mass percent of raw materials and 20 to 30 mass percent of adhesive for 10 to 15 minutes, putting into a mould, and performing hot press molding at the temperature of between 135 and 170 DEG C for 25 to 40s / mm under the pressure of between 2.0 and 3.5 MPa. The method has the advantages that: by modifying parameters of a material preparing stage, and transforming crushing, stirring and hot-pressing equipment in the operation process and modifying the hot-pressing technological parameters, the method reduces the density deviation, improves the internal bond strength, reduces the expansion ratio and free formaldehyde release amount and makes physical and mechanical indexes of the finished products exceed the standard of the like products.