Replaceable frame assembly for accommodating expansion card assembly and electronic device having the same

The present invention discloses a replaceable frame assembly, comprising: a substrate, a first fixing unit, a second fixing unit, a front panel, at least one electrical connection interface, a second electrical connection interface, a third electrical connection interface, and a side plate. The replaceable frame assembly is adopted for accommodating an expansion card assembly, and can be disposed in a case of an electronic device. After being disposed in the case, an electrical connection end of the first electrical connection interface is embedded into an electrical slot that is disposed on a main board, such that the expansion card assembly communicates with the main board through the second electrical connection interface, the third electrical connection interface, the first electrical connection interface, and the electrical slot, thereby making the expansion card assembly become an functional electronic module of the electronic device.