Disclosed is a pedestrian crossing intelligent monitoring device and detection method. The pedestrian crossing intelligent monitoring device comprises a video collection module, an embedded processing module, a video display module and an alarm module; the video collection module is used for transmitting collected color video images to the embedded processing module and the video display module through network cables simultaneously; the video display module is used for timely displaying the video monitoring actual situation; the embedded processing module is used for receiving the related electrical signal information of the video images, obtaining the information of crossing pedestrians through the detection of a crossing algorithm, displaying the information on the video display module and sending an alarm signal to the alarm module and accordingly an alarm can be given, the safety of a particular area is protected, and the intrusion of foreign objects is prevented. According to the pedestrian crossing intelligent monitoring device and detection method, the missed alarm and the false alarm are avoided to a great extent and meanwhile the convenience is brought to the crisis treatment of the monitoring personnel.