The invention discloses a passenger flow detection system based on face recognition and a detection method thereof. The key points of the technical scheme are that the passenger flow detection systemcomprises an image acquisition module and a passenger flow statistical server. The passenger flow statistical server comprises a storage module, a face analysis module and a flow analysis module whichare connected in turn. The image acquisition module is installed at the entrance and used for acquiring various angles of face image information of the target person. The storage module is used for storing the acquired image information of the target person. The face analysis module is used for recognizing the face information of each image and performing comparative analysis with other images inthe storage module. The flow analysis module is used for integrating the analysis result outputted by the face analysis module so as to obtain the passenger flow characteristics through statistics and form the trend chart. According to the passenger flow detection system based on face recognition, the customer information can be more deeply read and the accuracy can be greatly enhanced.