<p>For the first time, this study conducts a comparative analysis of the time-frequency characteristics of pre-earthquake gravity perturbations for M≥7.0 earthquakes based on data from two types of gravity instruments deployed in China, namely the iGrav-012 superconducting gravimeter and PET relative gravimeters. Four types of perturbation patterns are proposed herein. We applied the S-transform to analyze the time-frequency features of pre-seismic gravity anomalies after eliminating background values. The findings indicate that the frequency range of pre-seismic gravity anomalies associated with earthquakes of a magnitude of 7.0 or higher is non-fixed, with multiple potential dominant frequency bands. The disturbance amplitude presents four temporal variation modes: enhancement, attenuation, initial enhancement followed by attenuation, and no variation. Pre-seismic gravity anomalies are dominated by the tectonic setting and focal mechanism of the earthquake. Earthquakes characterized by adjacent epicentral positions, similar focal mechanisms, and triggering relationships exhibit analogous time-frequency characteristics of pre-seismic gravity anomalies. This research offers references and data support for the identification of pre-seismic gravity anomalies.</p>