The present invention provides a remote security monitoring device and system and a remote security monitoring method, which can improve security monitoring efficiency and monitoring accuracy. The remote security monitoring system comprises a remote security monitoring device and a smart device, wherein the remote security monitoring device, based on a preset smart device fingerprint database, performs port and vulnerability scanning on the smart device, determines the scanning risk of the smart device, performs early warning, receives malicious use behavior information and abnormal traffic data information of the smart device, carries out malicious use behavior analysis and feature matching with a preset security thread library, detects whether the smart device has a malicious use behavior and a privacy violation behavior, and carries out early warning if yes; and the smart device is used for collecting smart device behavior information and original traffic data information, analyzingthe smart device behavior information and the original traffic data information, acquiring the malicious use behavior information and the abnormal traffic data information of the smart device and reporting the information to a remote security monitoring device.