The invention discloses a satellite height measurement gravity data and gravity satellite data fusion method. The method comprises the basic steps of processing gravity satellite data by adopting an interpolation mode into a data matrix of the same size as satellite height measurement gravity data; adopting bior2.2 wavelet to conduct two-layer wavelet decomposition on the two kinds of data separately to obtain one low-frequency coefficient component and six high-frequency coefficient components; extracting the low-frequency coefficient component of the satellite height measurement gravity dataas a low-frequency coefficient component of fusion data; conducting weight fusion on the two-layer high-frequency coefficient components of the two kinds of data separately as a high-frequency coefficient component of the fusion data; adopting the bior2.2 wavelet to reconstruct the low-frequency and high-frequency coefficient components of the fusion data to obtain gravity fusion data. Accordingto the fusion method, precision characteristics of the satellite height measurement gravity data and the gravity satellite data in a frequency domain are taken into full consideration, and the data precision of a marine gravity field is improved by developing data fusion.