A single chip system and a reset method for the single chip system are disclosed. By detecting a reset pulse width of a reset pin (110) to determine whether to wake or reset a single chip, two functions of wakeup and reset are realized without increasing a system resource, thus reducing a number of input/output I/O interfaces and decreasing system resource consumption. The single chip system (100) includes: a reset pin (110), a control unit (120), a central processing unit CPU (130) and a peripheral (140), the single chip system (100) is connected to a master control system (200) via an end of the reset pin (110), the other end of the reset pin (110) is connected to the control unit (120), and the control unit (120) is connected to the CPU (130) and the peripheral (140), respectively, where the master control system (200) is configured to control the reset pin (110) to output a reset electrical level; and the control unit (120) is configured to detect a signal duration of the reset electrical level output by the reset pin (110), and trigger to wake or reset a single chip according to the signal duration of the reset electrical level, a signal duration for triggering wakeup is different from a signal duration for triggering a reset.
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