The invention discloses a target clustering method based on a ground surveillance radar system. The method comprises the following steps of acquiring target echo information after radar front-end processing; carrying out false plot filter processing on the target echo information in order to obtain filtered target echo information; carrying out speed clustering on the filtered target echo information in order to obtain target echo information after speed clustering on a distance library; carrying out distance clustering on the target echo information after speed clustering on the distance library in order to obtain target parameters and target echo information after distance clustering at the azimuth; and carrying out azimuth clustering on the target echo information after distance clustering at the azimuth in order to obtain target parameters and target echo information which belong to the same target after azimuth clustering. According to the method, the risk that the targets at different speeds are merged into the same target is reduced, the precision of target clustering is improved, and a reliable foundation is provided for follow-up track processing.