Device capable of prompting replacement of zinc rod

The invention discloses a device capable of prompting replacement of a zinc rod. The device capable of prompting replacement of the zinc rod is applied to a heat exchanger, the heat exchanger is provided with a shell, and a cooling medium is arranged in the shell. The device capable of prompting replacement of the zinc rod comprises a screw plug, the zinc rod and an indentifying object, the screwplug is screwed into the shell of the heat exchanger, and a through hole is formed in the head of the screw plug. The zinc rod is fixedly connected with the tail of the screw plug, the zinc rod is located in the shell, and a hole is formed in the end, close to the screw plug, of the zinc rod. The indentifying object is arranged in the through hole of the screw plug. The through hole of the screw plug communicates with the hole of the zinc rod. When the zinc rod corrodes the hole, the cooling medium enters the through hole of the screw plug and is in a color reaction with the indentifying object, and the replacement of