The invention provides a printing transmission data acquisition device for power system relay protection equipment, which is matched with management equipment and is arranged on a data line through which the relay protection equipment is connected with a printer. The printing transmission data acquisition device comprises a command receiving module for intercepting a relay protection equipment printing command, a data forwarding module for forwarding relay protection equipment printing data to the management equipment, a communication protocol interface conversion module for converting between the printing command and a data protocol, a printing control module for outputting management equipment printing data when the printer is started and the management equipment printing command is obtained, and a single-chip microcomputer. Through implementation of the embodiment of the invention, the relay protection equipment printing data can be relayed onto the management equipment, and the storage, calibration and edition of the printing data by the management equipment can be realized.