The invention discloses a high-signal-to-noise-ratio gas-liquid two-phase flow phase content detection method for a double-saddle structure. A round coil is applied to measurement in a two-phase flowphase content detection system so as to be evenly distributed in a space. In practical detection, a tested object is not positioned in a sensitive field, and in addition, the conductivity and the magnetic conductivity of the two-phase flow are low so as to cause low sensitivity and poor anti-jamming capability during traditional two-phase flow detection. In the method, since the detection system is under a resonant state, the measurement of the two-phase flow phase content is more sensitive than traditional electromagnetic detection. In addition, since an emission circuit and a receiving circuit are resonant at the same frequency, interference signals at different frequencies are not received by a detection coil, and the anti-jamming capability is high. In addition, the magnetic flux density of an excitation magnetic field generated by a saddle-shaped receiving and dispatching coil is evenly distributed along a measured pipeline, so that a two-phase flow pipeline is positioned in the sensitive field, and measurement is more accurate.