The utility model provides a natural gas lighter hydrocarbons recovery unit belongs to natural gas lighter hydrocarbons and retrieves technical field. It is complicated that it has solved current natural gas lighter hydrocarbons recovery unit structure, the poor problem of adaptability. This natural gas lighter hydrocarbons recovery unit, including refrigerant compressor, cold box, lime set pump, vapour and liquid separator, deethanizer, reboiler, refrigerant cooler, choke valve, reposition of redundant personnel tee bend, the tee bend a that converges, tee bend b converges, the feeding natural gas cools off in the cold box through the compression of refrigerant compressor, carries out gas -liquid separation, and the cold box is returned to the gaseous phase of separation, and to retrieve cold volume back outer defeated, and the lime set pump liquid phase for of gas -liquid separation ware steps up, gets into the deethanation top of the tower, is heated by the reboiler at the bottom of the tower, and the liquid phase product goes to store as the product more than the propane obtaining at the bottom of the deethanizer, and some is used for replenishing the refrigerant gaseous phase of top of the tower, and other are failed outward as the product.