The utility model discloses a DC fault data acquisition system, including the FTP server, the output of FTP server and voltage stabilizing module's input electric connection, the output of FTP serverpasses through current conversion station and data acquisition module's input signal connection, data acquisition module's output and data classification module electric connection, data acquisition module's output is connected with pulse acquisition module and hammering collection module respectively, data acquisition module is connected with control protection equipment, the output of FTP serverand the input electric connection who leads the electrical property detecting module. The utility model discloses a design scientific and reasonable, the security of processing data method is good, and the classification of data trouble is clear reasonable, has improved DC fault's treatment effeciency and precision widely, and the practicality is stronger, is worth wideling popularize.