The invention discloses a manufacturing method of a solid wood grain epidermis. The manufacturing method comprises the steps of longitudinally sectioning a tree trunk to be a half shape or a quarter shape; cutting a plane of the tree trunk with thin thickness to be a quantity of initial wood grain sheets; after orderly stacking and pressuring, using a cut-off knife to cut jagged four redundant edges to be wood grain sheets with same size; placing the fallers or winding lines of two quantizers at the two sides of the laminated wood grain sheets; respectively arranging one odd number layer at one side and one even number layer at the other sides at intervals; arranging side directions inside; then after coating viscid gum at two lateral edge faces; and using the quantizers to separate the two lateral edge faces of the wood grain sheets with preset layer number to form continuous wood grain sheets, so as to achieve the benefits of lowering cost and matching up automatic process.