To address the challenging measurement of oil-gas two-phase parameters in the return oil pipeline of an aeroengine lubrication system, a testing system for oil-gas two-phase flow of aeroengines based on electrical capacitance tomography has been developed. The cross-sectional phase fraction measurement is achieved using electrical capacitance tomography technology, and the flow pattern is regularized through a rectifier to enhance measurement accuracy, at the same time, the Venturi technology is utilized to achieve total flow measurement, ultimately leading to the measurement of gas-liquid two-phase flow. A calibration device for oil-gas two-phase measurement has been set up based on the field test bench for comparative testing of the measurement system. The results indicate that the maximum measurement error for liquid phase flow rate is 7.26 %FS, and the maximum measurement error for gas phase flow rate is 6.56 %FS under six experimental conditions. The research presented in this paper plays a crucial supporting role in the design of lubrication systems in the aeroengine field.