A double-function SiO2 coating with antireflection and superhydrophobic properties was fabricated through a cost-effective and time-efficient sol-gel method. Tetraethoxysilane was used as a precursor to obtain SiO2 with an antireflection property. Hexamethyldisilazane was used as a modifier to produce SiO2-DMS with a superhydrophobic behaviour. The SiO2-DMS coating had a water contact angle of 153 degrees and a water slide angle of < 10 degrees. The optimised SiO2-DMS coating had an average transmittance of 96.07% at a wavelength of 300-800 nm. The entire process could be completed in a short time.