The utility model relates to an anti-corrosion anchor device with unbonded tendons, which comprises an anti-corrosion device positioned at the anchor device end above an anchor padding plate and a sealing structure arranged between an anchor plate of the anti-corrosion device at the anchor device end and the anchor padding plate, namely, a round platform-shaped groove for placing seal rings is formed on the anchor padding plate, n seal rings are placed in the round platform-shaped groove, the total thickness of the n superimposed seal rings is larger than the depth of the round platform-shaped groove, and the seal rings are O-shaped seal rings with circular cross sections or Y-shaped or X-shaped seal rings with Y or X-shaped cross sections; a layer of anti-corrosion sealant is smeared between the anchor plate and the anchor padding plate, and the anti-corrosion sealant is non-drying sealant; and m small grooves with U-shaped or V-shaped cross sections are formed on the anchor plate or the anchor padding plate of the anti-corrosion anchor device with the unbonded tendons respectively so as to increase the capacity of the sealant, and the anti-corrosion device at the anchor device end can also be the existing anti-corrosion device at the anchor device end. The anti-corrosion anchor device with the unbonded tendons has good oil sealing effect and long anti-corrosion service life; and each of the m and the n can be any integer between 1 and 10.