The invention discloses a portable monitoring alarm device. A wireless communication module can realize real-time information transmission and communication in a mobile Internet access way; an audio/video communication module is used for stably transmitting voices and videos on line to realize a paging communication function; a posture detecting module is used for feeding posture information of a current device back to a main control board, and adjusting a position of a camera through a posture adjusting mechanism to keep a shooting picture right ahead; an automatic focusing module can be used for focusing a human face, acquiring human face image information, and storing an image of a wanted man in a storage; and a video analyzing module is used for automatically capturing and detecting the human face image focused in a video, comparing the human face image with the image of the wanted man, displaying the image and personal information of a suspect once the suspect is found, and making an alarm simultaneously. Through adoption of the portable monitoring alarm device, the voice communication function of an existing police pager is realized; a video communication function is added; meanwhile, real-time retrieving of the wanted man can be performed; and high system reliability and an extremely-low false alarm rate are achieved. The portable monitoring alarm device is particularly suitable for various daily duty sites.