A device for online measurement of gas-phase flux and liquid-phase flux of moisture in a horizontal pipe comprises a horizontal venturi pipe and a gamma ray detector. The horizontal venturi pipe comprises a truncated cone-shaped inlet channel (1) with section area reduced gradually, a cylindrical throat channel (2) and a truncated cone-shaped outlet channel (3) with section area increased gradually. The gamma ray detector comprises a gamma ray emitter (4) and a gamma ray inspection device (5) arranged in a manner that gamma rays emitted by the gamma ray emitter (4) can radially penetrate through the cross section of the throat channel (2) to reach the gamma ray receiver (5). A method for measuring the gas-phase flux and the liquid-phase flux of the moisture in the horizontal pipe by using the device is also provided.
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