In order to reduce the content of volatile organic compounds in inorganic boarddecorative coating，and improve its self-cleaning and hydrophobic properties，with the large particle size property of waterborne bio-based emulsions，the effects of pigment volume concentration（PVC），curing agents，and hydrophobic additives on the coating performancewere studied. It was concluded that when pigment volume concentration was 40%，the hardness of the coating was HB，the gloss was 6. 3，and the self-cleaning performance indicated the best.When the curing agent was HW-2100 and the addition amount of hydrophobic additive R-75was 1%，the water contact angle of coating was the largest，the coating indicated besthydrophobicity. Inorganic boards coated with waterborne bio-based hydrophobic coatings hadlow surface tension，pollutants were difficult to attach and easy to clean.