Deepwater blowout preventer hydraulic oil metering device

The invention discloses a deepwater blowout preventer hydraulic oil metering device comprising a metering pipe. A metering passageway penetrates through the metering pipe, a turbine is arranged in themetering passageway, a magnetic measurement module is arranged on the outer wall of the metering pipe, the metering passageway comprises a large hole section located on the upstream portion and a small hole section located on the downstream portion, and the large hole section and the small hole section are arranged in a same hole center line mode and communicate. The hole bottom, facing the smallhole section, of the large hole section forms an annular abutting face. A locking sleeve, a front flow straightening support, a casing pipe and a rear flow straightening support are sequentially embedded in the large hole section in the flow direction, the locking sleeve is in threaded fit with the upstream section of the large hole section, the locking sleeve sequentially presses the front flowstraightening support, the