Metering method and device for output liquid yield of producing well

The invention discloses a metering method and device for output liquid yield of a producing well. According to the method, gas-liquid separation is conducted on output liquid by utilizing a separator, large amount of gas is separated from liquid, the gas passes through an exhaust pipe at the upper portion of a tank and is metered through a gas flow meter, and the liquid enters a weighing tank from a buffering tank at the lower portion of the separator. The metering device is formed by assembling an upper tank body and a lower tank body, the upper tank body and the lower tank body are connected through an upper tank flange and a lower tank flange via bolts, completely sealed space is formed, and all material operation is completed in the space. Hydraulic weighing units of a hydraulic weighing part are evenly distributed on a circumferential plane in the lower tank body, and the hydraulic weighing units are communicated through hydraulic annular pipes, so that it is ensured that hydraulic oil pressure is evenly