An oil-gas-water three-phase flow meter comprises a main pipeline, wherein a commingler, a pressure sensor and a gas-liquid two-phase flow meter are respectively provided on a horizontal straight pipe section of the main pipeline, a flow computer is provided on a gauge outfit of the gas-liquid two-phase flow meter, a sampling by-pass pipe is connected on the horizontal straight pipe section of the main pipeline between the commingler and the gas-liquid two-phase flow meter, a flow regulating valve and a gas-liquid cylindrical cyclone are provided on the sampling by-pass pipe, a vapor pipeline on a top of the gas-liquid cylindrical cyclone is connected with a gas flow meter, a bottom of the gas-liquid cylindrical cyclone is connected with the liquid outlet pipeline, a mass flow meter.
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