The invention provides an electronic device. By reasonably and tidily arranging modules such as a mainboard, a fan module, a power supply module and a board card module in a case, more modules can be arranged in a limited space of the case, the utilization rate is high and the cost is low; the fan module, the power supply module and the board card module are independently designed and all modules cooperatively work with one another; each module is a clamping structure and can be disassembled and assembled with bare hands, and the operation and maintenance efficiency is improved; and signal transmission between all modules is completed by golden fingers and thereby the internal portion of the case is clean and tidy.