The invention provides a flexible bladder type anticorrosion device, an anticorrosion pile and a construction method using the same. The anticorrosion device comprises a cylindrical covering bladder body made of a flexible anticorrosion material, wherein the inner surface and the outer surface of the covering bladder body are respectively an irregular rough surface; the lower part inside the covering bladder body is provided with a sealing base; the periphery of the sealing base is connected with the surface of the lower part inside the covering bladder body; a slip-casting pipeline is arranged in the covering bladder body along the vertical direction; a low pressure slip-casting hole and a high pressure slip-casting hole are arranged under the sealing base on the slip-casting pipeline; the high pressure slip-casting hole is positioned above the low pressure slip-casting hole; and the middle-upper part of the side wall of the covering bladder body positioned under the sealing base is provided with more than one high pressure serum via holes. The anticorrosion pile comprises the flexible bladder type anticorrosion device, and aims at providing the flexible bladder type anticorrosion device, the anticorrosion pile with long-term reliable anticorrosion performance, high bearing capacity, good corrosion resistance, high durability and low manufacturing cost, and the anticorrosion pile and the construction method using the device for pile foundation in a high corrosion stratum and composite foundation construction.