Functional module mounting rack, functional module and computer

A functional module mounting rack comprises a mounting seat; the two fixing pieces are respectively arranged on the mounting seat in a sliding manner; the elastic piece elastically abuts against the two fixing pieces; the driving part is arranged on the mounting seat in a sliding manner, is connected with the two fixing parts in a sliding manner and is used for driving the two fixing parts to slide in the direction away from or close to each other; the driving part can slide between a first position and a second position, when the driving part is located at the first position, part of each fixing part extends out of the mounting base, the distance between the two fixing parts at the first position is larger than the distance between the two fixing parts at the second position, and the length of the elastic part at the first position is larger than the length of the elastic part at the second position. The functional module mounting rack is simple in structure and convenient to disassemble and assemble. The in