Device and method for measuring three-phase flow of produced liquid of oil field production well

The invention discloses a device and method for measuring three-phase flow of produced liquid of an oil field production well. The device comprises a controller and a measuring device body; the measuring device body comprises a first electromagnetic valve, a separator, a liquid level sensor group, a second electromagnetic valve, a pipeline pump, a third electromagnetic valve, an integrated weighing module and water content monitoring equipment. According to the device, the automation of three-phase flow measurement processes such as the liquid outlet amount water content, the liquid amount mass of the liquid outlet amount and the liquid amount volume of the liquid outlet amount is achieved through control connection between the controller and all components, and the automation of cleaningis achieved; the flow is counted and calculated in real time, the mass change of the separator is monitored in real time, the three-phase flow of the liquid outlet amount is measured in real time, andthe measurement precision