The invention relates to a transcritical low-temperature air energy generating set for new energy resource. The workflow of the transcritical low-temperature air energy generating set is as follows: after being pressurized by a booster pump, liquid working medium flows to a heat exchanger to output cold, is then turned into high-pressure supercritical fluid by a heat absorber, and expands to do work to generate electricity, part of the working medium is condensed by the heat exchanger, and then flows to the booster pump, and thereby an electricity-generating circulation system is formed; part of the working medium is throttled, expanded, cooled and depressurized to output cold, is then pressurized and cooled, and then flows to a throttle valve, and thereby a condensation circulation system is formed. The transcritical low-temperature air energy generating set also can be used for generating electricity with medium- and low-temperature heat sources such as residual heat, waste heat and terrestrial heat. The transcritical low-temperature air energy generating set condenses the working medium under the critical state, the cold in the system is sufficiently recycled, the power consumption of circulation is minimum, an outside cold source is not needed, the thermoelectric efficiency is high, the energy conversion density is high, the unit power investment is low, the cost is low, and the production of the cold air does not consume electricity. The transcritical low-temperature air energy generating set successfully breaks through the key difficult technology of low-temperature solar thermal power generation in terms of low thermal efficiency.