Heat exchanger, boiler flue gas waste heat recycling equipment and boiler

The invention relates to a heat exchanger, boiler flue gas waste heat recycling equipment and a boiler. The heat exchanger comprises a box body, a heat exchange pipe, a scraping plate and a driving assembly. The box body is used for containing liquid. The heat exchange pipe is arranged in the box body, and the two ends of the heat exchange pipe are connected to the side walls of the two sides of the box body respectively and communicate with the external environment. And an avoiding hole is formed in the scraping plate, so that the scraping plate is movably arranged on the outer side of the heat exchange tube in a sleeving manner. The driving assembly is used for driving the scraping plate to move in the axial direction of the heat exchange pipe. According to the technical scheme, due to the fact that the scraper is movably arranged on the outer side of the heat exchange tube in the sleeving mode, the edge of the receding hole can scrape off bubbles attached to the heat exchange tube, the situation that the c