The present invention can reduce the capacity of the distillation column because the natural gas used in the process is precooled and the engine is extracted by using the liquid stream. In addition, since the precooled feed gas replaces the role of the refrigerant required in the extraction process The present invention relates to an engine extraction system capable of simplifying a process and increasing the efficiency of a natural gas, which is cooled in a cold box disposed on a flow path through which natural gas is introduced into an NGL extraction column, And a condenser for cooling the natural gas evaporated in the engine extraction column to divide the natural gas into a gaseous state and a liquid state and to recover the distilled natural gas in the liquid state into the engine extraction column And cooling the first stream, which is a portion of the liquid stream separated by the scrubber, A first heat exchanger for exchanging heat between the first stream and the gaseous natural gas branched from the condenser and recovered in the cold box, and a second stream, which is the remainder of the liquid stream separated by the scrubber, And a second heat exchanger for exchanging heat between the second stream and the natural gas flowing into the condenser from the engine extraction column.
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