Reminding device for cleaning and maintenance of heat exchanger

The utility model belongs to the technical field of heat exchangers, and discloses a heat exchanger cleaning and maintenance reminding device which comprises an observation box and an observation block, the observation box is provided with a containing cavity, the observation block is arranged in the containing cavity of the observation box in a sliding mode, and the periphery of the observation block makes contact with the inner wall of the observation box. The observation block divides the accommodating cavity into a first cavity and a second cavity, the first cavity is communicated with a cooling pipe water inlet of the heat exchanger, and the second cavity is communicated with a cooling pipe water outlet of the heat exchanger; the observation box is configured so that the position of the observation block can be observed through the observation box from outside the observation box. According to the heat exchanger cleaning and maintenance reminding device, the cleaning and maintenance period of the heat ex