The gas-liquid two-phase inlet and feed retarder can help slow down the speed of the gas-liquid two-phase fluid when entering the separator and remove the large-size droplets entrained in the gas at the same time. The gas phase entrains the remaining small-size liquid oil into the high-efficiency separation meter above, and the liquid collected by the high-efficiency separation blade is collected under the blade. The collected liquid is introduced into the bottom of the separator by the guide pipe under the action of its gravity and discharged from the bottom of the separator.