The utility model discloses a natural gas takes off hydrocarbon device, including feed gas precooler, raw materials gas separator, feed gas aftercooler, refrigeration facility, low temperature separation ware and the pure hydrocarbon liquid injector pump that connects gradually. The utility model discloses an actively the effect is: effectively utilize low temperature mellow wine hydrocarbon liquid and change the natural gas and constitute, paraffin component in precooling after separating desorption feed gas, water and heavy hydrocarbon in feed gas aftercooler and refrigeration facility cooling after -separating desorption feed gas again. The utility model discloses can avoid cooling down the in -process because paraffin causes the condition of jam to can further reduce the separation temperature, reduce hydrate inhibitor's injection rate, reduce the operating cost effectively, improve natural gas low temperature separation efficiency.