1. An image target relative position determining method, comprising: obtaining a target initial position, and performing a sparse sampling according to the target initial position; dividing sampling points into foreground sampling points and background sampling points; clustering adjacent foreground sampling points according to a spatial distribution of the foreground sampling points and obtaining a clustering result containing a plurality of clusters; and performing a robust estimation according to the clustering result and determining a relative position between a target and a camouflage interference in an image.