A light high-strength fiber cement fly ash building wallboard and its complete set of equipment, which use cement, silica powder, fly ash, plant fiber, methylcellulose (MC) and water as raw materials, and the wallboard can not only be used in construction Inner partition walls, and can be used for building exterior walls, exterior decorative walls, and public facilities such as sound insulation walls, firewalls, retaining walls, enclosures, etc., and can also produce such as L-shaped, baseboards, mirror lines, etc. The special-shaped board avoids the low technical index and the singleness of product types in the traditional wallboard production. It has high strength, exquisite and beautiful appearance, not easy to deform, and has outstanding performances such as bending resistance, anti-corrosion, anti-ultraviolet radiation, anti-freezing and thawing, machinability, heat preservation, sound insulation, and fire prevention.