A dielectric filter, comprising: a first dielectric block and a second dielectric block that are stacked up, wherein the first dielectric block and the second dielectric block respectively comprise a first surface and a second surface that are opposite to each other, and the first surface of the first dielectric block is opposite to the second surface of the second dielectric block; a first blind hole, a first through hole, and two or more resonance through holes whose openings are located on the first surface of the first dielectric block; and a second through hole whose opening is located on the second surface of the second dielectric block, wherein metal layers are disposed on an inner wall of the first blind hole, an inner wall of the first through hole, an inner wall of the resonance through holes, an inner wall of the second through hole, the first surface of the first dielectric block, and the second surface of the second dielectric block; and the metal layer (1011, 1041) on the first surface of the first dielectric block is opposite to the metal layer (2011, 202) on the second surface of the second dielectric block, the metal layer (1011, 1041) on the first surface of the first dielectric block is connected to the metal layer (2011, 202) on the second surface of the second dielectric block, the metal layer on the inner wall of the first through hole is connected to the metal layer on the first surface of the first dielectric block, the metal layer on the inner wall of the first blind hole is connected to the metal layer on the first surface of the first dielectric block, and the metal layer on the inner wall of the second through hole is connected to the metal layer on the second surface of the second dielectric block. a first dielectric block and a second dielectric block that are stacked up, wherein the first dielectric block and the second dielectric block respectively comprise a first surface and a second surface that are opposite to each other, and the first surface of the first dielectric block is opposite to the second surface of the second dielectric block; a first blind hole, a first through hole, and two or more resonance through holes whose openings are located on the first surface of the first dielectric block; and a second through hole whose opening is located on the second surface of the second dielectric block, wherein metal layers are disposed on an inner wall of the first blind hole, an inner wall of the first through hole, an inner wall of the resonance through holes, an inner wall of the second through hole, the first surface of the first dielectric block, and the second surface of the second dielectric block; and the metal layer (1011, 1041) on the first surface of the first dielectric block is opposite to the metal layer (2011, 202) on the second surface of the second dielectric block, the metal layer (1011, 1041) on the first surface of the first dielectric block is connected to the metal layer (2011, 202) on the second surface of the second dielectric block, the metal layer on the inner wall of the first through hole is connected to the metal layer on the first surface of the first dielectric block, the metal layer on the inner wall of the first blind hole is connected to the metal layer on the first surface of the first dielectric block, and the metal layer on the inner wall of the second through hole is connected to the metal layer on the second surface of the second dielectric block.