The invention discloses a method and system based on big data for searching missing tourists in a scenic spot. The method comprises face recognition, scene recognition and the establishment of a tourist relationship network. The search system includes a cloud service platform and a data collection subsystem. The cloud service platform further includes a face recognition module, a scene feature extraction module, a trajectory generation module and an information storage module. The data collection subsystem further includes an identity information collection module, an image acquisition module,a navigation module, a step counting module, a communication module and a voice module. According to the invention, through the functions of scene recognition, scenic spot navigation and the like, the information of the scenic spot is collected subtly, therefore, the system and the method are easy to be received by tourists, the usage rates of the system and method are improved, and therefore, apurpose of good search is achieved. In addition, messages of missing persons are selectively pushed through a relation network, tourist resources are greatly used, and the waste of manpower is avoided.