The utility model provides a differential pressure type oil level metering device, which is used for metering the levels of an upper oil guide box and a lower oil guide box, and comprises an oil level stabilizator capable of acquiring stable oil pressure and connected with the upper and the lower oil guide boxes via pipelines, an upper oil level limit valve and a lower oil level limit valve both mounted in the oil level stabilizator, and a differential pressure transducer. The positive pressure side of the differential pressure transducer is directly connected with the oil level stabilization via a pipeline, so as to convert the height of the oil level into a current signal for output. The differential pressure type oil level metering device provided by the utility model has an excellent anti-interference ability, thereby realizing real-time and reliable detection to the upper oil guide level.