The invention discloses a method and a system for collecting and analyzing crowd information. The method comprises steps: in the same designated detection area, a WiFi probe is used for collecting a broadcasting data packet of a WiFi device, and a photographing device is also used for collecting video/image data, wherein the broadcasting data packet comprises collecting time, the device MAC address and a signal intensity; and in combination of the broadcasting data packet and the video/image data, crowd information analysis is carried out. According to the embodiment of the invention, the WiFi probe and photographing device information collecting modes are combined and used, people counting is carried out according to the information collected by the two, advantages of the two can be integrated, the people counting result accuracy in a designated environment can be greatly improved, and subsequent application is facilitated, and besides, the information collected by the two can be analyzed comprehensively, a crowd portrait with a more delicate content can be formed, the method and the system can be applied to applications such as cost per thousand impressions and cost per thousand attentions, and a stable and reliable basis is laid for subsequent application.