The utility model discloses an oil well metering device, include: the buffer tank, its inside first separator and second separator of being provided with, first separator and second separator are separated the buffer tank for first cavity, second cavity and third cavity from bottom to top, and first cavity passes through second intercommunication elbow and second cavity intercommunication throughfirst intercommunication elbow and second cavity intercommunication, third cavity, is provided with the first opening that is used for the feed liquor on the second cavity, and the position that is close to first separator on the second cavity is provided with the second opening, be provided with the third opening on the third cavity, the level gauge, its one end and first cavity intercommunication, the other end and third cavity intercommunication, first pipeline with second opening intercommunication is provided with mass flow meter on the first pipeline, second pipeline with third opening intercommunication is provided with the governing valve on the second pipeline. The utility model provides an oil well metering device, be convenient for the transportation, the practicality is strong,maneuverability is strong.