The invention discloses water-resistant 
abrasive base paper and a production method thereof. The water-resistant 
abrasive base paper is prepared from the following raw materials in parts by weight: 32-35 parts of 
softwood pulp fibers, 32-35 parts of 
hardwood pulp fibers, 5-10 parts of 
polyester fibers, 10-15 parts of modified 
thermoplastic resin, 3-5 parts of a water-proofing agent and 3-5 parts of an oil-proofing agent. The preparation method comprises the following steps: (1) mixing, crushing, pulping and repulping the 
softwood pulp fibers, the 
hardwood pulp fibers and the 
polyester fibers in parts by weight; (2) starching by a fourdrinier 
machine; (3) molding and 
drying a 
paper sheet on the fourdrinier 
machine, and carrying out gumming treatment once online, wherein the glue quantity is 10%-15%; (4) after 
drying the glue obtained in the step (3), carrying out secondary gumming on the front surface of the 
paper sheet, wherein the glue quantity is 6%-10%; and (5) calendaring the 
paper sheet which is gummed for the second time in the step (4) by a soft calendar. The Water-resistant 
abrasive paper prepared from the water-resistant abrasive base paper has the advantages of good waterproofness, softness, 
solvent resistance, dimension stability, high dry strength, good high 
temperature resistance and good 
weathering resistance.