The invention discloses a preparation process of a zero-carbon wood fiber environment-friendly sheet synthesized by waste circuit board powder. The pressing raw materials of the environment-friendly sheet comprise: circuit board recycled powder, wood fiber powder, a cross-linking agent, a waterproofing agent, and carbon filament fiber; the production process of the sheet comprises the following steps of: drying the circuit board recycled powder at a constant temperature; converting wood fiber auxiliary materials into wood fiber powder above 80 meshes, drying, and then stirring under 180 DEG C to form carbon fiber powder; adding a processing assistant and blending uniformly again; and feeding materials, paving pressing plates, pressurizing, standing, complementing pressure, and gently decompressing to produce the sheet. The pressure during the production process is controlled so that the sheet is stable in quality and high in intensity; the sheet synthesized by wood fiber powder obtained by recycling crop straw, bamboo and wood saw powder and the like with the waster circuit board powder can be sawn, drilled, processed, and shaped easily; furthermore, the sheet is excellent in waterproof and fireproof performances, and high in static bending strength; and the utilization of waste materials reaches the purposes of environmental protection and low carbon.