The invention discloses a feature extraction and discrimination method for an AC side fault type of an AC/DC hybrid power grid, and the method comprises the following steps of extending an AC symmetrical component method to the AC/DC hybrid power grid, proposing a sequence component network model of the AC/DC hybrid power grid, studying a sequence network mapping relationship between the DC side and AC side electrical quantities, extracting and analyzing the DC side electrical quantity features, and discriminating the AC fault type combined with the sequence network mapping relationship of theAC/DC hybrid power grid. The method adopted by the invention focuses on analyzing the interaction between the AC side and the DC side in the AC-DC hybrid power grid and quantitatively analyzing the mapping relationship between the AC and DC electric quantities, thereby realizing the rapid discrimination of the AC fault by extracting and analyzing the electrical component of the DC side.