An anti-theft alarm device for protecting an electronic device (S) from theft, the anti-theft alarm device comprising a host , a connecting member and an alarm wire , wherein: the host comprises a main control device , a charging contactor and an internal connecting wire , wherein the charging contactor is connected to the main control device by the internal connecting wire disposed in the host ; the connecting member is fixedly attached to the electronic device (S) and comprises a charging terminal , a charging wire and an alarm connecting wire , wherein the charging terminal and the charging wire are electrically connected, the charging wire is used for connecting a charging port of the electronic device (S), and the alarm connecting wire is in use connected to the electronic device (S) via a connector and is used for connecting the alarm wire and the electronic device (S); the alarm wire is used for connecting the alarm connecting wire and the main control device ; the charging contactor and the charging terminal are electrically connected when the host and the connecting member are mechanically connected; the host and/or the connecting member further comprises an elastic element configured to provide a stress when the charging terminal and the charging contactor are in contact with each other; and the main control device comprises an alarm detection module, wherein the alarm detection module, the alarm wire , the alarm connecting wire and the electronic device (S) constitute an alarm loop circuit, and the alarm detection module is configured to receive a signal when an abnormal event of the alarm loop circuit, in the form of a circuit disconnection, occurs. the host comprises a main control device , a charging contactor and an internal connecting wire , wherein the charging contactor is connected to the main control device by the internal connecting wire disposed in the host ; the connecting member is fixedly attached to the electronic device (S) and comprises a charging terminal , a charging wire and an alarm connecting wire , wherein the charging terminal and the charging wire are electrically connected, the charging wire is used for connecting a charging port of the electronic device (S), and the alarm connecting wire is in use connected to the electronic device (S) via a connector and is used for connecting the alarm wire and the electronic device (S); the alarm wire is used for connecting the alarm connecting wire and the main control device ; the charging contactor and the charging terminal are electrically connected when the host and the connecting member are mechanically connected; the host and/or the connecting member further comprises an elastic element configured to provide a stress when the charging terminal and the charging contactor are in contact with each other; and the main control device comprises an alarm detection module, wherein the alarm detection module, the alarm wire , the alarm connecting wire and the electronic device (S) constitute an alarm loop circuit, and the alarm detection module is configured to receive a signal when an abnormal event of the alarm loop circuit, in the form of a circuit disconnection, occurs. <EOS>