The utility model provides a PCI (Peripheral Component Interconnect) card module. The PCI card module comprises a shell, a circuit board, a PCI card and a strengthening module, wherein the circuit board is fixed on the bottom surface of the shell and provided with a slot perpendicular to the circuit board; the PCI card is provided with a front end, a back end and an inserting part located between the front end and the back end and the inserting part is inserted into the slot along the direction perpendicular to the circuit board, the front end of the inserting part is fixed on the shell, and the lower part at the back end of the PCI card is provided with a protruding structure; and the strengthening module comprises a fixing piece, a slider and a locking piece, wherein the fixing piece is provided with an opening hole, fixed on the bottom surface of the shell and located at one side of the protruding structure, and the slider is slidably arranged in the fixing piece and is provided with a stop part and a notch. When the slider slides to a specific position relative to the fixing piece, the protruding structure is blocked at the stop part so that the PCI card is limited and can not move along the direction perpendicular to the circuit board. The slider is locked at the fixing piece by the locking piece through the notch and the opening hole.