The present invention relates to a module extraction apparatus of a high voltage direct current system. In the present invention, a fixed base (30) is secured to a structure (82), and a sub-module (10) is mounted on a movable base (60) that slides on the fixed base (30), thereby enabling the sub-module (10) to be extracted from the structure (82). The sub-module (10) may be separated into a power unit (12) and a capacitor unit (24) which may be separately extracted from the structure (82). A connection support (84) is connected to the fixed base (30) and installed to protrude toward the outside of the structure (82), and the tip end of the connection support (84) extending toward the outside of the structure (82) is supported by a wire (86). As described above, the present invention has an advantage of more easily extracting the module, which is a heavy object, from the structure (82) to carry out the maintenance thereof.