Disclosed are a cavity high-Q three-mode dielectric resonance structure and a filter containing the resonance structure, the resonance structure comprising a cavity and cover plate, wherein an arrangement inside the cavity is composed of a cube-like dielectric resonance block and a dielectric support frame; the cube-like dielectric resonance block and the dielectric support frame constitute a three-mode dielectric resonance rod; between the three-mode dielectric resonance rod and an inner wall of the cavity is air; one or any end of the cube-like dielectric resonance block is connected to the dielectric support frame respectively; the dielectric support frame is connected to the inner wall of the cavity; and the cube-like dielectric resonance block forms a three-mode resonance in three directions of axes X, Y and Z of the cavity. Compared to existing cavity filters, the volume of the cavity filter of the present invention is reduced by 40% and the insertion loss is reduced by more than 30%, which can ensure that a high-Q value is obtained at a smaller spacing between the resonance rod and a cavity body.
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