A system for verifying the validity of assembled PCI devices of a computer includes: a device database (2) for storing data of PCI devices being inserted in PCI slots of a computer; a slot database (3) for storing PCI slot data of the computer; a data checking module (1) for obtaining the computer's PCI device data and PCI slot data from the device database and the slot database, integrating the PCI device data and PCI slot data, generating configuration data of a PCI device, and determining whether the PCI device is assembled with validity. A method for verifying the validity of assembled PCI devices of a computer is also disclosed.