An injection type waste-heat heat pump set adopting R141b refrigerant belongs to the technical field of energy and refrigeration. The outlet of a reservoir of the heat pump set is respectively connected with an expansion valve and a liquid pump through a pipeline, the outlet of the liquid pump is connected with an inlet of an injector through a generator, the outlet of the expansion valve is connected with an injection port of the injector through an evaporator, the outlet of the ejector is connected with the reservoir through a condenser, and the outlet of the reservoir is connected with the outlet of the liquid pump through a reflux valve. The heat pump set further adopts the R141b refrigerant, adopts a programmable logic controller (PLC) to control the electricity in centralized mode, adopts an evaporation type condenser, and both the evaporator and the generator adopt light plate-fin heat exchangers. The heat pump set is simple in structure, convenient to use and maintain, high in heat efficiency and good in reliability, and is greatly improved in application and popularization. In addition, a system of the heat pump set runs under positive pressure.