The invention discloses a circulation water low-level renewable energy heating system of the cooling towers in thermal power plants and refrigeration enterprises; the heat energy is extracted from themiddle or lower-level renewable energy by a thermal pump set; the temperature of the heat-supply once side water-supply reaches approximately 60 DEG C. the low-level renewal energy heating system canoperate efficiently, stably and economically. The low quality heat energy is converted into high quality heat energy on the premise of having no change on the enterprise device in operation; the highquality heat energy is outputted by a heat conveying device. The heating system is composed of a water source thermal pump 10, a renewable energy collecting device 9 and a heating device 11; the water source thermal pump is a closed circulation pipeline with heat exchange medium and composed of the serial connection of an evaporator 4, a compressor 5, a condenser 6 and an expansion valve 3; the renewable energy collecting device is constructed that a cooling water circulation water pump 1 is connected with a circulation water outlet pipeline of a steam condenser; the pressurized low quality hot water is connected with the water inlet of the water source thermal pump 10 through an electronic valve 2; the water outlet of the water source thermal pump 10 is connected with a water mixer 8 through a pipeline; the heating device 11 adopts the radiator group 12 of the heat consumer to construct the circulation pipe network through a heat network circulation pump 7.