Non-intrusive multiphase flow holdup detection method and device based on continuous waves

The invention relates to the technical field of multiphase flow holdup detection, in particular to a non-invasive multiphase flow holdup detection method and device based on continuous waves, and a central control unit is provided with a plurality of detection points; at any detection point, the flow velocity detection unit determines the flow velocity of the multiphase fluid; the flow detection unit calculates the flow of the multi-phase fluid flowing through the detection point; the water phase content detection unit calculates the water phase content; the oil phase content detection unit calculates the density, the oil phase content and the gas phase content of the oil-water mixed liquid; the central control unit determines whether the detection precision of single detection meets the standard or not, determines whether the detection precision of the detection point meets the standard or not, determines the reason that the detection precision of the detection point does not meet the standard under the cond