Waste heat recovery device for boiler and the boiler with the same

The utility model relates to a waste heat recovery package for a boiler; the waste heat recovery package for a boiler comprises a return water tank of boiler, a heat-absorption water tank arranged on the flue, wherein the heat-absorption water tank is provided with a flue channel which extends from the bottom of the heat-absorption water tank to the top of the heat-absorption water tank. The heat-absorption water tank is internally provided with a plurality of heat-absorption steel pipes; the external side wall of the heat-absorption water tank is provided with a water inlet and a water outlet; the water inlet and the water outlet are respectively connected with the water return tank of the boiler via pipelines. According to the utility model, the secondary recovery utilization of the waste heat of the boiler is realized, the water intake temperature of the boiler is raised greatly, and the purpose of saving coal, saving energy and protecting environment is achieved; and the thermal efficiency of the boiler i