The invention discloses a zero-superheat-degree running refrigerating system at an evaporator outlet. The refrigerating system comprises a compressor, a main evaporator, a condenser, an economizer, an ejector, a gas-liquid separator and an auxiliary evaporator, wherein in the ejector, the pressure difference between intermediate-pressure flash steam generated by the economizer and the air suctionport of the compressor is taken as ejecting power to drive the refrigerating system for performing secondary evaporation on a liquid-state refrigerant separated from a refrigerant at the evaporator outlet by using the gas-liquid separator. By adopting the refrigerating system, the main evaporator can run efficiently without the superheat degree of the outlet refrigerant, the non-evaporated liquid-state refrigerant is separated out and fully evaporated in the auxiliary evaporator, and a higher refrigerating efficiency is achieved.