The utility model discloses a boiler smoke waste heat recovery system which aims to solve the problem of heat loss of smoke discharged by an existing thermal power plant boiler. According to the boiler smoke waste heat recovery system, multiple separate-type mixed working medium heat pipe exchangers are adopted, each separate-type mixed working medium heat pipe exchanger is composed of a heat absorption section and a heat release section, each heat absorption section and the corresponding heat release section are connected with each other through a steam pipeline and a liquid return pipe to form a loop, the heat absorption sections of the separate-type mixed working medium heat pipe exchangers are arranged step by step in sequence in the smoke flowing direction, and the corresponding heat release sections are arranged step by step in inverted sequence in the flowing direction of heated working media; as a result, it is guaranteed that the arrangement mode is flexible, resistance to a flue is reduced, the temperature difference between the smoke and the heated working media is reduced, and the thermal economy is good.