The invention discloses a safety monitoring method, device and system and a storage medium. The method comprises the following steps: receiving identity identification and signal intensity of an RFIDtag worn by at least one monitored person and identified and sent by RFID (radio frequency identification) card readers in a monitoring region, wherein the RFID card readers in the monitoring region are in grid layout; obtaining archives information of the RFID tag according to the identity identification, and/or calculating movement dynamic information of the RFID tag according to the signal intensity sent by at least one RFID card reader; judging whether a preset trigger event has occurred according to the movement dynamic information of the RFID tag and/ or the archives information; and ifso, carrying out a preset intervention action on the trigger event. The method can realize accurate positioning and no-dead-angle safety monitoring of the monitored objects in the whole campus.