Underground light non-aqueous phase liquid removing device

The invention provides an underground light non-aqueous phase liquid removing device which comprises a floating barrel and a liquid collecting tank, a connecting hose is arranged between the floating barrel and the liquid collecting tank and used for communicating fluid between the floating barrel and the liquid collecting tank, a sliding guide rod extending in the vertical direction is arranged on the upper portion of the liquid collecting tank, and the floating barrel comprises a filtering part and a buoyancy adjusting part connected to the lower portion of the filtering part. The filtering part and the buoyancy adjusting part are arranged to be arranged on the sliding guide rod in a sleeving mode, so that the floating barrel can slide up and down along the sliding guide rod, the liquid collecting tank is communicated with the liquid outlet pipe, it can be guaranteed that a liquid inlet of the floating barrel is always kept nearby the position above an interface between LNAPLs and water by changing the qual