Whispering gallery resonator (WGR) represent a promising avenue for the miniaturization of optical devices, while cascaded optical parameter oscillator (OPO) processes haven’t been realized in WGR, to the best of our knowledge. We presents a microdisk with quality factors up to 3.2×107, then embed two quasi phase-matching (QPM) structures inside it to demonstrate cascaded OPO. The cascaded OPO exhibits the same idler light output with the threshold 32.7mW at 36℃ (1063.8nm→1566.6nm+3314.6nm/1566.6nm→2970.4nm+3314.6nm), while operating threshold of OPOwithout cascade process is 4.32mW. Moreover, diverse cascaded processes are observed, with the longest output wavelength reaching 4802.9 nm. Our results suggest the potential for a low-threshold cascade OPO based on WGR.