Wall-hanging stove with waste heat recovery function and working method thereof

The invention discloses a wall-hanging stove with a waste heat recovery function and a working method thereof, and relates to the field of wall-hanging stoves. The wall-hanging stove comprises a machine box, a control panel is arranged on the surface of the machine box, an exhaust air blower is fixedly installed at the top of an inner cavity of the machine box, and the output end of the exhaust air blower is fixedly connected with a ventilation box. One side of the ventilation box extends upwards and is connected with the top of the inner cavity of the machine box, the top end of the ventilation box is fixedly connected with a ventilation port, and the top end of the ventilation port extends out of the machine box. Two expansion water tanks are arranged at a water outlet, one expansion water tank is used for receiving cold water, the other expansion water tank is used for conducting heating and heat preservation on the cold water, heating and heat preservation are conducted through a high-temperature flue gas