Green density boards are generally moisture-proof density boards. In order to distinguish product performance, manufacturers will add different pigments to distinguish the functional uses of density boards. For example, green is added to moisture-proof density boards, red is added to flame-retardant density boards, etc. During the production process of moisture-proof density boards, melamine or MDI type adhesives are added, and the amount of waterproofing agent used is increased to improve the moisture-proof properties of the board,thereby achieving the purpose of moisture-proofing. At the same time, in order to distinguish it from ordinary density boards and other special density boards, green dye is added during the production process. The shade of green will change with storage time and sunlight, but it will not affect its moisture-proof performance.