A protection monitoring method based on a mobile intelligent terminal is characterized in that firstly, a magnetic sensor is installed in the mobile intelligent terminal, and corresponding drive software is installed at the same time; secondly, a magnetic transmitter matched with the magnetic sensor is installed on an object needing protection monitoring; thirdly, the corresponding relation, including time and distance, between the object needing monitoring and the mobile intelligent terminal is automatically built by means of the drive software in the mobile intelligent terminal, and the type of a prompt report is determined; finally, the magnetic sensor uninterruptedly monitors the well-set to-be-monitored object, collected data is submitted to the mobile intelligent terminal, and the mobile intelligent terminal records, calculates, analyzes and manages the data; according to the analysis of the data, the mobile intelligent terminal judges whether or not the mobile intelligent terminal or the to-be-monitored object provided with the magnetic transmitter is located in the safe state, and according to a situation triggering prompt, a prompt message is sent in the forms of sound, light signals and the like. The method has the advantages that monitoring is flexible and reliable and the energy consumption is low.