An anti-lost notification method, applied to an anti-theft device, wherein the method comprises: counting, by the anti-theft device in real time, a quantity of steps that is in the first preset duration prior to each moment, so as to obtain the step count value that is in the first preset duration before the connection is disconnected.; determining whether a step count value in first preset duration before a connection between the anti-theft device and a peer device is disconnected is greater than a preset value (Step 101); if the step count value is greater than the preset value, determining whether a signal quality value sequence of a communication signal between the anti-theft device and the peer device shows a progressively decreasing trend in the first preset duration before the connection is disconnected (Step 102); and giving an alarm if the signal quality value sequence shows a progressively decreasing trend in the first preset duration before the connection is disconnected (Step 103); wherein the method further comprises: giving an alarm if the signal quality value sequence does not show a progressively decreasing trend in the first preset duration before the connection is disconnected, and the connection is not restored after being disconnected for second preset duration; and skipping starting an alarm if the signal quality value sequence does not show a progressively decreasing trend in the first preset duration before the connection is disconnected, and the connection is restored after being disconnected for second preset duration. counting, by the anti-theft device in real time, a quantity of steps that is in the first preset duration prior to each moment, so as to obtain the step count value that is in the first preset duration before the connection is disconnected.; determining whether a step count value in first preset duration before a connection between the anti-theft device and a peer device is disconnected is greater than a preset value (Step 101); if the step count value is greater than the preset value, determining whether a signal quality value sequence of a communication signal between the anti-theft device and the peer device shows a progressively decreasing trend in the first preset duration before the connection is disconnected (Step 102); and giving an alarm if the signal quality value sequence shows a progressively decreasing trend in the first preset duration before the connection is disconnected (Step 103); wherein the method further comprises: giving an alarm if the signal quality value sequence does not show a progressively decreasing trend in the first preset duration before the connection is disconnected, and the connection is not restored after being disconnected for second preset duration; and skipping starting an alarm if the signal quality value sequence does not show a progressively decreasing trend in the first preset duration before the connection is disconnected, and the connection is restored after being disconnected for second preset duration. giving an alarm if the signal quality value sequence does not show a progressively decreasing trend in the first preset duration before the connection is disconnected, and the connection is not restored after being disconnected for second preset duration; and skipping starting an alarm if the signal quality value sequence does not show a progressively decreasing trend in the first preset duration before the connection is disconnected, and the connection is restored after being disconnected for second preset duration.