The anticorrosion and antibiofouling of marine engineering equipments have strong demands, especiallyfor antibiofouling. In this work, an in-situ growth layered double hydroxide (LDH) coating on aluminumalloys (AA) 7075 was prepared and then modified by sodium pyrithione (SPT) to increase the anticorrosionand antibiofouling performance. Results indicated that CoAl-LDHs and CoAl-LDHs-SPT coatings hadbeen successfully prepared according to TEM, XRD, XPS, Raman spectra, and SEM analysis results. The(0 1 2) plane of LDHs with a interplanar spacing of 0.26 nm was recognized from TEM images. The contentof SPT in CoAl-LDHs-SPT is 38.79 wt.%. Electrochemical impedance spectroscopy (EIS) and polarizationcurvies demonstrate that the corrosion resistance of AA 7075 was largely improved in the presence ofCoAl-LDHs and CoAl-LDHs-SPT coatings while the anticorrosion performance of CoAl-LDHs-SPT coatingwas better. The corrosion resistance of Co-Al LDHs-SPT coating increased by about two orders of magnitudecompared with the bare AA 7075. The surface analysis results show that only a few Pseudomonasaeruginosa and Spirulina cells attached to the CoAl-LDHs coating surface, and no biofouling cells wereobserved for the CoAl-LDHs-SPT coating. Co-Al LDHs-SPT coating possessed the best anticorrosion andantibiofouling properties due to the presence of SPT compared with the CoAl-LDHs coating.