Anti-corrosion device capable of automatically adding zinc bars

The utility model discloses an anti-corrosion device capable of automatically adding zinc bars, which belongs to the technical field of anti-corrosion, and comprises a transversely arranged main body, a channel is axially arranged in the main body, the main body is provided with a placing port and a placing box which are communicated with the channel, and the placing box is positioned in a seawater environment; a detection unit used for detecting the remaining amount of the zinc bars is arranged in the containing box, a first permanent magnet and a first electromagnetic coil are arranged on the side, away from the containing box, of the containing opening in the channel, the first permanent magnet is slidably installed in the channel, and the first electromagnetic coil is sleeved with the first electromagnetic coil and installed on the main body; the outer side of the first permanent magnet is sleeved with a first return spring, and the two ends of the first return spring abut against the side, away from the