The invention discloses a radar precision stable platform operation reliability assessment method. The method comprises the following steps: carrying out adaptive quantitative decomposition and noisereduction on a dynamic signal of the radar precise stable platform by adopting an adaptive integrated noise reconstruction empirical mode decomposition method based on a noise precise estimation technology; constructing a radar precise stable platform multi-dimensional state space by utilizing the effective signal quantitative expression of the radar stable platform state information, and calculating to obtain normalized singular entropy characteristic indexes which truly reflect the running performance and the degradation condition of the radar precise stable platform; and according to the normalized singular entropy characteristic index, constructing a radar precision stable platform operation reliability assessment model, and reasonably assessing the operation reliability of the radar precision stable platform. The method can adaptively and quantitatively extract the radar stable platform state characteristic information under the complex operation condition in the severe service environment, reasonably evaluate the operation performance and degradation condition of the platform, and effectively reveal the mechanical reliability gradual change characteristic of the radar precisestable platform.