Low-temperature separation of gas is an on-site natural gas treatment process aimed at gas condensate recovery. The process technology hinges on the liquid-gas mixture separation in a stagewise manner and with the use of low temperatures at the final separation stage and recuperation of the cold received either from the reservoir energy or the chilling cycle. It may be applied in any climatic zone, it allows presence of non-hydrocarbon components in gas, ensures compliance of the water dew point and the hydrocarbon dew point of gas with the Industry Standards and the condensate recovery level (C5H12 + higher) up to 97 per cent (hydrocarbon dew point corresponds to separation temperature).