Natural gas well fluid separator

The utility model relates to the technical field of natural gas extraction, and discloses a natural gas well fluid separator which comprises a mandrel, a plugging column and a circumferential sealing mechanism. An upper circulation opening and a lower circulation opening which are communicated with the outside are formed in the two axial ends of the mandrel respectively, an upper fluid channel and a lower fluid channel which extend in the axial direction of the mandrel are formed in the mandrel, the upper fluid channel and the lower fluid channel are communicated with each other, and the inner diameter of the upper fluid channel is smaller than that of the lower fluid channel. The plugging column is arranged in the lower fluid channel in an axially movable mode and is constructed to do reciprocating motion between a plugging position and an opening position. The circumferential sealing mechanism is arranged around the mandrel. The plugging column is constructed to block communication between the upper fluid c