In this study, the miniaturized demonstration system shows the performance of the low noise background. By inserting specific test modules, it can be utilized to test and evaluate the key technologies towards the next-generation earth gravitational detection mission, such as the noise performance of an ultra-stable optical bench, the dynamical adaptability of the detector and the phase meter, and the data post-processing algorithm for the suppression of the optical phase locking. Therefore, the high-precision miniaturized demonstration system is a powerful tool in the future research of the space-based laser ranging interferometer.