The utility model discloses a floor board with a low dilatation coefficient. The floor board sequentially comprises a wear-resistant layer, a printing layer, an aggregate layer I, a glass fiber layer, an aggregate layer II and a base material layer from top to bottom. The floor board has the advantage of being strong in rigidity. Meanwhile, the coefficient of thermal expansion of the floor board is reduced. In addition, an active functional group covers the surface of quartz sand, the defect that the surface of the quartz sand is poor in activity is overcome, and the combination degree of the quartz sand in the material system is improved.