The invention relates to the application of a sand-fixing agent in sand-fixing and control of sand damage. The sand-fixing agent is composed of 88-94% polyvinyl alcohol, 1-2% boric acid and 4-10% sawdust. When using, add water to dilute, stir evenly, and then spray evenly. The sand-fixing agent is a colorless, transparent, slightly turbid liquid with no peculiar smell, viscosity of 12Pa.s-15Pa.s, no sinking at 10-70°C, and experimental compressive strength of 1.0Mpa-12.1Mpa at low temperature of 10-20°C The weight loss rate is 0-1.8%, the intensity loss rate is 0-42% after 300 hours of ultraviolet light irradiation, and the wind erosion amount is 0.05g.h-1.100cm2 under the experimental wind speed of 5.0-25.0m/s. 0.5 cm thick consolidation layer. In the control of wind and sand hazards in the wild, the effective period is 5-10 years. In addition, it is water-resistant, environmentally friendly, has good mechanical properties, and does not produce secondary pollution.