Abstract: Superhydrophobic coating is a kind of coating with special wettability on the surface. it has received extensive attention and research because of its excellent performance in the fields of self-cleaning, oil-water separation, antibacterial, anti-corrosion, etc. In this paper, sodium stearate (NaSt) and sodium oleate (NaOL) were used to modify the surface of aragonite and calcite CaCO3 powders, and then the modified CaCO3 powders were blended with polydimethylsiloxane (PDMS) to obtain CaCO3/PDMS based superhydrophobic coatings. The results showed that when the content of NaSt and NaOL was 5% of the substance participating in the reaction, the modification effect of CaCO3 powder was the best, and the hydrophobicity of the prepared CaCO3/PDMS coating was the best. At the same time, the influence of the amount of CaCO3 with different crystal forms on the hydrophobicity of the coating was investigated. The results showed that when the mass ratio of CaCO3 to PDMS was 1.5:1, the contact angle of the CaCO3/PDMS coating was>150°, and the coating was super hydrophobic. The test results of its self-cleaning ability and stability showed that the methylene blue pollutants on the surface of the glass plate coating could be completely washed away with the liquid droplets without residue, and the contact angle was still more than 140°under the impact of 500 mL water with a speed of 5 m/s, which showed the durability and stability of the coating working age.