The invention discloses a consolidation growth-promoting stabilizer, and a preparation method and an application method thereof. The stabilizer is composed of the following components, by weight: 20-50% of common Portland cement, 1-30% of fly ash, 5-10% of silica fume, 30-50% of dihydrate gypsum, 0.5-1.5% of a dispersant, and 5-15% of sodium polyacrylate. The above components are prepared into liquid by using water with the method disclosed by the invention. When in use, with the method disclosed by the invention, soil is consolidated with a slurry injection manner using a high pressure gun. The stabilizer provided by the invention has high stabilization capacity and high adhesion to soil. With the stabilizer, soil capacities of absorbing and storing water can be improved. While an easily-weathered slope is effectively stabilized, sowed seed normal germination and growth can be ensured and can be promoted to a certain extent. Therefore, erosion can be resisted, vegetation restoration can be promoted, and good soil stabilization and regeneration effects can be realized. When the stabilizer is used in treatments of desertified areas and slopes, even more outstanding effect can be performed.