The invention discloses a universal bus assignment and cascade device and an application system thereof. The universal bus assignment and cascade device is used as a physical connection channel between an ICT device and a resource pool; the universal bus assignment and cascade device comprises an outgoing bus and an incoming bus; the communication between the outgoing bus and an incoming bus is dynamically configured and managed through a configuration and management body; the resource pool is formed by a replaceable device stripped of from the ICT device; before being stripped off, the replaceable device is connected to the ICT device through bus. The universal bus assignment and cascade device of the present invention is a general-purpose device for various kinds of buses which may be used in the ICT device, and can solve problems of various bus interconnections among processors, devices and the card boards of the ICT device. The problems of bus-level interconnection among ICT devices can be also solved.