Disclosed is a device for starting a mobile hotspot, including: a password sending module, configured to send a Bluetooth pairing password and a preset start password to a mobile terminal that previously accessed a mobile hotspot via WIFI; a working state detecting module, configured to: detect the working state of mobile hotspot; a sleep triggering module, configured to trigger the mobile hotspot to enter into a sleeping state when detecting that the mobile hotspot has no user access and/or no data service; a Bluetooth module, configured to establish a Bluetooth connection with the mobile terminal and receive a password sent by the mobile terminal when the mobile hotspot is in the sleeping state; a start controlling module, configured to compare the password with a locally stored start password and control the mobile hotspot to enter into the working state when the comparison result is that they are consistent.