The invention discloses a mountain-based occultation prediction method. According to the method, the positional velocities of all GNSS navigation stars under a WGS84 coordinate system are obtained according to the positioning device of an occultation detector; the positional velocity, longitude, latitude and altitude of a mountain-based observation station are calculated; the pitch angles and azimuth angles of all the GNSS navigation stars relative to the observation station are calculated; whether the obtained pitch angles Elv, azimuth angles and antenna installation orientations meet the threshold of an occultation event is judged; and if the obtained pitch angles Elv, azimuth angles and antenna installation orientations meet the threshold of the occultation event, it is judged that theGNSS navigation stars are under a condition of occultation. Since continuous arc segments are adopted to judge an occultation event, the accuracy of a prediction result is enhanced. The method is simple and highly feasibly, and has important application value for real-time prediction.