∶ Amphiphilic Janus sheets with mesoporous were synthesized by one-step method of sol-gel reaction via interface-induced phase separation of oil-in-water emulsions. The grafting amounts of hydrophilic amino groups (—NH₂) and hydrophobic phenyl groups (—Ph) on both sides of Janus sheets were adjusted by changing the addition amounts of 3-aminopropyltrimethoxysilane (APTMS) and phenyltriethoxysilane (PETS), respectively. A series of Janus sheets with different hydrophilic/hydrophobic properties (α-Janus-β) have prepared. Using α-Janus-β as functional fillers of the water-based epoxy (WEP) coating to prepare Janus/WEP composite coatings. Hydrophobic and corrosion resistance of WEP coating were significantly improved because of the good dispersion of hydrophilic groups and the barrier protective layer constructed by the self-orientation of the hydrophobic groups when adding the Janus sheets which prepared by setting the mass ratio of APTMS to PETS as 2:1 (α₄-Janus-β₂) with 3% mass fraction of the WEP. The water contact angle of the WEP composite coating is increased from 59° to 90°. The electrochemical impedance value of the coating could reach 3.7×10₇ ^Ωcm₂ ^{after a 30-day}s test cycle. The coating remained protection ability during salt spray test after 1440 h.