The embodiment of the invention provides a moving object monitoring method, device and system and an electronic device. The method comprises the following steps: obtaining a target detection value array corresponding to a motion detector array; wherein the motion detector array is provided with an array visual area, the array visual area comprises a plurality of sub visual areas, and the pluralityof sub visual areas are formed by crossing visual areas of all motion detectors included in the motion detector array; determining a target sub-view area corresponding to the target detection value array from a preset first corresponding relation; wherein the first corresponding relationship is a corresponding relationship between the detection value array and the sub-visual area with the movingobject; and determining the target sub-vision area as a target area where the moving object currently entering the array vision area is located. According to the embodiment of the invention, the moving object can be finely positioned.