Sleep control method for Internet of Things system

The invention provides a dormancy control method for an Internet of Things system. The dormancy control method comprises the following steps: 1, obtaining a dormancy trigger event; 2, reporting a dormancy trigger event to a power management module, and judging whether the NB-IoT communication module allows dormancy or not by the power management module; 3, enabling the NB-IoT communication module to update a general user identification module file; 4, enabling the NB-IoT communication module to inform a physical layer that the power is about to be cut off; 5, enabling the NB-IoT communication module to sleep the information to be stored; 6, enabling the NB-IoT communication module to register a dormancy timer in the power management module, and determining the dormancy state of the universal user identification module at the same time; 7, enabling the power management module to control the real-time clock to operate the sleep timer. Electric energy consumption of equipment can be reduced, and the service life