The invention provides a Beidou MEO satellite airborne reflection signal modeling method used for sea surface height measurement, and belongs to the satellite navigation field. The Beidou MEO satellite airborne reflection signal modeling method comprises mathematical derivation of a reflection signal model, solution of mirror surface reflection point time delay, and the establishing of the reflection signal model. A theoretical Z-V model correlation value curve is decomposed into reflection signal-related functions having different time delay intervals and different amplitudes, and modeling is carried out by taking the reflection signals of the mirror reflection points as first reflection signals. The Beidou MEO satellite reflection signal modeling problem is solved by using reversed thinking, and compared with a conventional forward modeling method, model complexity and calculated quantity are reduced, and at the same time, a mathematical formula is used for derivation, the modeling method is suitable for various programming languages to complete software and hardware realization, and then parameters required by the height measurement is considered during the model establishing process, and therefore the established model can be directly used for remote sensing height measurement, and guarantee is provided for researching of Beidou satellite reflection signal analog simulation and a simulator.