The invention discloses a floor waterproof material manufacturing method, which comprises the following steps: step 1, preparing a mixed resin emulsion, step 2, preparing a mixed solution, step 3, preparing an impregnation suspension emulsion, step 4, preparing a waterproof impregnation emulsion, and step 5, preparing the floor waterproof material. The coating is prepared from water-soluble phenolic resin, a waterborne polyurethane resin emulsion, hydrophobic silicon dioxide, talcum powder, a flame retardant, nano magnesium oxide, aluminum oxide, sodium pyrophosphate, melamine and a nano paraffin emulsion. The wood floor has the waterproof effect by preparing the waterproof material into the dipping emulsion for waterproof dipping, complex attaching or coating processing is not needed, construction is convenient and fast, the waterproof effect is remarkable, the formed waterproof layer has good abrasion resistance by adding the aluminum oxide powder, and the waterproof effect is good.The wood floor is protected while the waterproof layer is protected, the flame retardant enables the waterproof layer to have the flame retardant effect, and the flame retardant effect of the wood floor is better.