Abstract: An expansion card module is provided. The expansion card module is adapted for being assembled to a circuit board. The circuit board includes a connector and a fixing unit. The expansion card module is fixed between the connector and the fixing unit. The expansion card module includes an expansion card and a shielding plate. The expansion card has an end plugged in and electrically connected to the connector. The shielding plate includes a first portion and a second portion. The first portion covers a part of the expansion card. The second portion extends to an outside of the other end of the expansion card, and is fixed by the fixing unit.