The invention provides a wooden floor anti-moth agent. The preparation method comprises: taking 0.5-50 parts of a chlorine dioxide precursor, 0-15 parts of a corrosion inhibitor and 0-15 parts of a surfactant, and uniformly mixing; adding 0.5-20 parts of an activator, 0.5-50 parts of a neutral oxidant and 0.5-15 parts of a synergist, and uniformly mixing to obtain the product.