The invention relates to the field of safety pre-warning technology, specifically to a safety pre-warning method based on a mobile terminal, a device and a mobile terminal. The method comprises steps of recording the using time and using times of the mobile terminal, calculating the using efficiency of the mobile terminal according to the using time and using times,matching the using frequency with the preset memory frequency, if the matching result is inconsistent, level-I safety pre-warming is started at the mobile terminal. The technical scheme can provide pre-warning for the personal safety of mobile terminal users and solve the safety problem of the crowd living alone.