The invention discloses an ultra-wide tunable resonator and relates to a microwave device. The ultra-wide tunable resonator comprises a low-resistivity silicon electrode, an SOI executor and a metalized evanescent mode cavity part which are arranged from top to bottom in sequence, wherein the SOI executor comprises a high-resistivity silicon baseplate and a high-resistivity silicon ring; the bottom surface of the high-resistivity silicon ring and the high-resistivity silicon baseplate are isolated through buried oxygen; the top surface of the high-resistivity silicon ring is connected to the low-resistivity silicon electrode through an insulating material layer; a first gold layer is arranged at the bottom surface of the high-resistivity silicon baseplate; the metalized evanescent mode cavity part comprises an evanescent mode cavity and a resonance rod etched and reserved in the evanescent mode cavity; a second gold layer covers the inner surface of the evanescent mode cavity and the top surface of the resonance rod; a first dielectric material layer is also arranged above the gold layer at the top of the resonance rod; and a dielectric material is filled in the evanescent mode cavity. According to the ultra-wide tunable resonator, the tunable frequency is realized, and the ultra-wide tunable resonator has low power consumption, fast drive, no hysteresis effect, good linearity and high precision and reliability.