Disclosed in the present application is a four-mode dielectric resonator-based narrowband filtering rat-race coupler, comprising a four-mode dielectric resonator, a metal cavity and four feed metal rods. The four feed metal rods and the four-mode dielectric resonator are close to one another in parallel to couple with each other. The four feed metal rods are a first metal rod, a second metal rod, a third metal rod and a fourth metal rod, respectively. The connection line between the second metal rod and the central point of the metal cavity is perpendicular to the connection line between the third metal rod and the central point of the metal cavity, the first metal rod is located on the central axial plane of the second metal rod and third metal rod, and the connection line between the fourth metal rod and the central point of the metal cavity is perpendicular to the connection line between the first metal rod and the central point of the metal cavity. The narrowband filter rat-race coupler proposed by the present invention has the features of miniaturization and high integration, involves an inventive step and is industrially applicable.
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