Fuente: Wipo "IOT" The invention discloses a switching method and system for NB-IoT (Narrow Band Internet of Things) terminals and a computer readable storage medium, which relate to the technical field of the Internetof things. The method includes the following steps: an NB-IoT terminal in a moving state sends a measurement report to an NB-IoT source base station to which a current cell belongs; the NB-IoT sourcebase station judges whether the switching condition is satisfied according to the measurement report, and sends a switching request to an NB-IoT target base station to which a target cell belongs if the switching condition is satisfied; the NB-IoT source base station issues a switching command to the NB-IoT terminal after the NB-IoT target base station confirms the switching request; the NB-IoT terminal sends the last uplink data packet to a C-SGN (Cellular Internet of Things-Service Gateway Node) through the NB-IoT source base station; after receiving the last uplink data packet, the C-SGN determines the breakpoint serial number of the uplink data packets according to each uplink data packet received, and sends the breakpoint serial number to the NB-IoT terminal through the NB-IoT sourcebase station; the NB-IoT terminal is randomly accessed to the NB-IoT target base station after moving to the target cell; and the NB-IoT terminal sends the uplink data packets to the C-SGN through theNB-IoT target base station in order of serial number from small to large by starting from the breakpoint serial number of the uplink data packets.