Anti-lost device and anti-lost method applying same

The invention relates to an anti-lost device and an anti-lost method applying the same. The method comprises the following steps: S01, the anti-lost device is provided to be used as a slave machine; S02, a host machine is provided, and the host machine is matched with the slave machine through Bluetooth; and S03, when the distance between the host machine and the slave machine exceeds a preset value, the slave machine and the host machine give an alarm. According to the anti-lost device and the anti-lost method, the existing anti-lost mode of binding is completely eradicated, the loss of matched objects can be prevented through the simple and small anti-lost device, the device has a simple structure and is low in cost, and the method is practical and has a better practical value.