The invention discloses an automatic selecting method for hi-precision control point in a big remote sensing image. The automatic selecting method provided for fitting re-sampling control point is, hi-precision fitting matching is conducted on a sub image of certain size, then sample is taken anew in the matched sub image, and the sample is used as the control point for a big image. The most important advantage with the invention is that, the final control point is not directly detected by prior way but by an indirect way, this avoids the difficulty in direct extracting of hi-accuracy controlpoint in prior way, and allows easy adjustment of the distribution of the final control point. The invention analyzed and compared by different accuracy-evaluating methods a lot of experimental results, and proves that the selected control point can reach sub-pixel accuracy, and the method is a practical and robust selecting method for control points.