The invention discloses a preservation device of a galvanized copper bar. The preservation device comprises a box body. A storage plate is arranged in an inner cavity of the box body, a copper bar body is arranged on the top of the storage plate, the two sides of the top of the storage plate are both fixedly connected with connecting frames, the two sides of the inner wall of the box body are bothfixedly connected with heating devices, the portions, located at the front ends of the heating devices, of the two sides of the inner wall of the box body are both fixedly connected with supporting rods, fans are arranged at the ends, away from the inner wall of the box body, of the supporting rods, and the top of the inner cavity of the box body is fixedly connected with a fixing plate. Throughthe arrangement of the heating devices, the fans, electric telescopic rods, movable rods, check blocks, sealing gaskets, a supporting plate and an air exhauster, the inner cavity of the box body can be dehumidified and further vacuumized, meanwhile, the problem that the preservation effect of a traditional preservation device is not good enough is solved, and the preservation device of the galvanized copper bar has the beneficial effect of being good in preservation effect and is worthy of being popularized.