The utility model provides a passenger flow monitoring device for subway station, passenger flow monitoring device include that a plurality of takes the photograph camera, video analysis host computer and monitoring alarm host computer, and each is taken the photograph camera and sets up respectively on a platform of subway station, and a plurality of is taken the photograph camera and is connected with video analysis host computer electricity respectively, and video analysis host computer is connected with the monitoring alarm host computer is electric, each takes the photograph camera real -time picture information of gathering corresponding platform respectively to with picture message routing to video analysis host computer, the picture information of each platform is received to video analysis host computer, and send the host computer to monitoring alarm with objective current density distributed data, the monitoring alarm host computer is received visitor current density distributed data to the induced information of output passenger flow. Through the utility model discloses can improve control efficiency, reduce the control error rate, improve the induced and early warning efficiency of passenger flow to improve passenger's degree of experience.