The embodiment of the invention discloses a pedestrian counting method and device based on monitoring of multiple cameras and relates to the field of image processing. The pedestrian counting method and device are applied to a scene which at least includes the first camera and the second camera and are used for counting pedestrians in the large scene provided with the multiple cameras. The pedestrian counting method comprises the steps that the overlap region of a first image shot by the first camera at a first moment and a second image shot by the second camera at the first moment is obtained; a first number of the pedestrians in the first image, a second number of the pedestrians in the second image and a third number of the pedestrians in the overlap region are obtained; the total number is obtained according to the first number, the second number and the third number.