The invention discloses a target positioning precision optimization method based on multi-type surveying and mapping satellite repeated observation. in order to improve the positioning precision of asatellite repeated observation target, the single observation positioning precision and the nominal overall positioning precision of the satellite are utilized; The method comprises the following steps: establishing an error model, carrying out standardization processing on residual errors to correct a weight function, determining an optimal harmony coefficient through satellite simulation data and actual observation data experiments, eliminating or reducing the weight of an observation value with abnormal error distribution, and optimizing a target repeated observation positioning result to improve the positioning precision of the target repeated observation positioning result.