Wet natural gas measuring method and system

The invention provides a wet natural gas measuring method and system. The method comprises the steps that wet natural gas is rectified and passes through a measuring device; obtaining the pressure P of the wet natural gas entering a front shuttle cone in the measuring device, the pressure difference delta P1 between the wet natural gas and the upstream of the porous pore plate, the pressure difference delta P2 between the wet natural gas and the downstream of the porous pore plate, and the pressure difference delta P3 between the wet natural gas and the outlet of a rear shuttle cone; and according to P, deltaP1, deltaP2 and deltaP3, calculating the moisture gas phasor and liquid phasor of the wet natural gas. Compared with other wet natural gas measuring devices, the wet natural gas measuring method and system are small and compact in structure and light in weight; the long-term stability is good; stable flow of gas-liquid two-phase flow in a pipeline can be realized, and the device can adapt to measurement o