The invention discloses a multi-reference clock weighting synthesis method, which solves the problem of poor combined clock precision and stability, comprising the steps of: obtaining a clock signal from a plurality of clock sources; performing noise removal synthesis on the clock signal to obtain clock signals for removing noise; classifying the clock signals for removing noise firstly by a KNN classification algorithm, and performing the weighted synthesis on the classified signals to obtain a clock synthesis signal. Before performing noise removal synthesis on the clock signal to obtain a noise-removed clock signal, abnormal signal detection is performed on the clock signal to remove singular points in the clock signal. The frequency accuracy of the frequency reference signal achieved by the invention is on the order of n x E-14, which is superior to the high quality single chirp clock by one to two orders of magnitude. The invention may simultaneously improve the short-term and long-term stabilities of clock sources.