The invention relates to a manufacturing method for an ecological decoration plate, and belongs to the technical field of decoration materials. The soya bean glue insect prevention ecological decoration plate comprises a fir core veneer layer located in the middle, gum wood veneer layers and poplar veneer layers. The gum wood veneer layers are bonded to the upper face and the lower face of the fir core veneer layer. The poplar veneer layers are bonded to the outer surfaces of the gum wood veneer layers. The adjacent veneer layers are bonded in the direction that wood grain is perpendicular. The adjacent veneer layers are bonded through formaldehyde-free modified soya bean glue. By means of the structure, the ecological decoration plate is a core-plate paint-free ecological decoration plate and has a paint-free function, the veneer layers are bonded through the formaldehyde-free modified soya bean glue, environment friendliness, high stability and low formaldehyde emissions are achieved, and the soya bean glue insect prevention ecological decoration plate is manufactured.