The utility model relates to a cladding and corrosion preventing structure of a bottom margin plate of a vertical storage tank. The cladding and corrosion preventing structure is composed layered protection layers which are arranged on the tank wall (1) of the tank body at the combination portion of the vertical storage tank and the bottom margin plate and arranged on the margin plate (4) in a coated mode. The cladding and corrosion preventing structure is characterized in that the protection layers comprise a corrosion preventing paste layer (3), a corrosion preventing cement gum layer (7), a corrosion preventing belt (2), an elastic polymer anti-corrosion layer (10) and a weather-proof surface coating (9) from inside to outside, and the multi-layer cladding and corrosion preventing structure is formed in the mode that the elastic polymer anti-corrosion layer (10) seals a polyester fiber cloth (8), the corrosion preventing belt (2), the corrosion preventing cement gum layer (7) and the corrosion preventing paste layer (3) in an inner wall space formed by the elastic polymer anti-corrosion layer (10) in a separated mode.