An automatic screening method for fault recording documents in a grid fault information system comprises the following steps: reading fault recorder information, judging whether a grid goes wrong or not, judging analog quantity sudden change data, judging switching value tripping data, marking the data as an internal fault, carrying out fault location, marking the located fault as an external fault, and the like. The automatic screening method has the advantages that data recorded by a fault recorder can be screened, classified and stored automatically; only the part related to fault equipment is reserved to facilitate targeted analysis of fault data for related technical personnel.