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The invention provides a positioning and tracking method based on a video monitor network. The method comprises obtaining geographical coordinates of each video monitor device, establishing a space coordinate system of the video monitor network, with the video monitor device being as the center and according to the monitoring range; selecting a feature point to perform surveying and mapping, and obtaining geographical coordinate of the feature point and corresponding pixel values of the feature point in imaging matrix of the video monitor device; with the feature point being as a control point, carrying out projection conversion and coordinate transformation so as to enable other ground pixel points in the imaging matrix to have corresponding geographical coordinates; when a target appears in the monitoring range, calculating geographical coordinates of the target by obtaining the coordinate of the pixel point where the target lies and combining environment circumference relation; and forming the movement track of the target by taking the geographical coordinates of different frames of the target in the video monitor network. According to the method, the movement track of the target can be positioned and tracked quickly; existing resources of a city is effectively utilized; and more accurate movement route of the target is output.