The weak mechanical and chemical stability, poor pitting resistance and high-temperature curing condition still persist as major challenges for scale-up applications of most superhydrophobic coatings. To address these problems, an omnipotent ambient-curable superhydrophobic coating embedding with electroactive polyaniline/halloysite nanotubes (PANI/HNTs) was constructed in this work via facile spraying technique, using ethylene (hydroxyl-alkyl) vinyl ether as film-forming material. Fluorinated SiO2/HNTs were fabricated and integrated into the coating matrix to create re-entrant curvature and nano/micro structured papillae in pursuit of high surface roughness. The resultant extraordinary superhydrophobic surface with water contact angle of 158.1 degrees and sliding angle of 1.9 degrees gave rise to prominent self-cleaning and anti-fouling abilities. The obtained strong adhesive strength, high durability to withstand mechanical challenges, superior chemical stability under corrosive media and especially pitting resistance at defect sites under hyper-salinity environment are assumed to ensure the long-term protection of metal substrates. Based on the electrochemical analysis, the protective mechanisms involving physical barrier function of binary superhydrophobic surface and passivation effect of PANI/HNTs nanofiller are proposed. The ambient-curable one-pot strategy in this work potentially opened up a new avenue for coatings with integrated functionalities, which present enormous application value under vigorous erosive/abrasive environment.