The utility model relates to the technical field of access systems, and particularly relates to a time-differential access system. The system comprises an upper computer, a communication module and a processor which are electrically connected sequentially, wherein the processor is respectively connected with a memory chip, a time-differential controller and a timer; and the time-differential controller is connected with at least one access. The time-differential access system can be used for effectively implementing time-differential authorization for specific time, specific persons or specific equipment and solving the problem that employees miss attendance-checking.