The invention belongs to the technical field of wood processing, and relates to a process for manufacturing a floor base material, in particular to a process for manufacturing a damp-proof low-water-swelling floor base material and a method for manufacturing adhesive. The process for manufacturing the damp-proof low-water-swelling floor base material includes the following steps of wood peeling, chipping, screening, washing, cooking, fiber separating, glue mixing and applying, drying and sorting, paving and forming, prepressing, hot pressing, cooling, sanding, inspecting and grading, and packaging and storage entering. According to the special requirements of the damp-proof low-water-swelling floor base material, the melamine modified urea resin damp-proof adhesive is adopted, and the floor base material with the high waterproof and damp-proof performance is developed according to the low thickness swelling rate of water absorption and damp-proof requirements and based on the production process of a common floor base material. The floor base material manufactured through the method is low in cost and high in quality and has the damp-proof function, the low thickness swelling rate of water absorption of a floor made of the base material is low, and the floor has the damp-proof function and is suitable for home service environments in a high damp state.