The invention discloses an anti-cracking sulphate aluminium cement plant fiber product, being prepared from the following component raw materials in parts by weight: sulphate aluminium cement, bits of wood, silica fume, coal ash, glass fiber, water, retarder, water-retaining agent, thickener and antimitotic agent. The preparing method comprises: (1) weighing the respective component raw materials in parts by weight; (2) adding the sulphate aluminium cement, bits of wood, silica fume, coal ash and glass fiber in to water and stirring, adding the water-retaining agent, thickener and antimitotic agent and stirring, standing; (3) adding the retarder, stirring, conveying into a roller level production workshop, entering a template, filling, performing roller leveling to produce a wet panel, cutting, and then conveying into a curing workshop for curing. The product has a smooth surface, no cracks, no cracking phenomenon, high strength and high durability; further, the product has easily obtained raw materials and low cost and the preparing method is low in cost and easy and simple to operate.