<p>The fracture performance of artificial rock is greatly affected by the loading rate. The variation of frequency domain and time domain characteristics reflects the damage and crack propagation inside the sample, and the variation of fracture parameters can reflect the crack resistance and failure mechanism of artificial rock. Fracture tests on artificial rock rectangular beams were conducted at five loading rate levels using coupled mechanical-optical-acoustic multi-physics fields to investigate the effect of loading rate on the fracture parameters of three-point bending specimens. Based on the experimental data, the time domain and frequency domain parameters of AE are extracted by the fast Fourier transform algorithm, and the stretch signal and shear signal are classified by GMM clustering algorithm. In general, the change of loading rate will significantly affect the AE fracture parameters and deformation field. It provides guidance and reference for further study of loading rate effect and failure mechanism, scientific research and engineering design.</p>