Combining the photocatalytic activity with the superhydrophobicity of coating is an effective approach for the self-cleaning effect. In this paper, the porous aluminum surface was coated with trialkoxy-terminated polydimethylsiloxane/titanium dioxide (PDMS/TiO2) coating (APT) by a solution immersion method. According to the analysis by Fourier-transformed infrared spectroscopy and X-ray photoelectron spectroscopy, a bond (Ti-O-Si) between PDMS and TiO2 is formed. The results by scanning electron microscopy and energy dispersive spectroscopy show that the superhydrophobicity is due to the interconnected hierarchical sheet structure and the PDMS with a low surface energy. The surface of APT coating has a stable superhydrophobicity with a water contact angle (WCA) of 161.6° and a sliding angle of less than 10°. The stability of superhydrophobicity with WCAs greater than 150°remains after 24 h ultraviolet irradiation. The ATP coating has an effective photocatalytic activity and an ability to degrade dyes and remove some organic substances on the surface.