The present disclosure provides a system for network delay guarantee based on flow aggregates and interleaved regulators according to an embodiment of the present disclosure includes: at least one unit network configured to guarantee first-in-first-out (FIFO) for flow aggregates; and at least one interleaved regulator per flow aggregate located at input port or an output port of the at least one unit network, wherein among flows passing through the unit network, flows having the same network input port and the same network output port are aggregated into a single flow aggregate.