Abstract: An anti-theft alarm device for protecting an electronic device from theft, includes a host, a connecting member and an alarm wire. The host includes a main control device, a charging contactor and an internal connecting wire. The charging contactor is connected to the main control device by the internal connecting wire in the host. The connecting member is fixedly attached to the electronic device and includes a charging terminal, a charging wire and an alarm connecting wire. The charging terminal and the charging wire are electrically connected. The charging wire is for connecting a charging port of the electronic device. The alarm connecting wire is for connecting the alarm wire and the electronic device. The alarm wire is 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.