The invention relates to a frequency-sensitive filter, belonging to the passive filter technique. A yoke is equipped on an iron pillar, the C-shaped part of the yoke is downward, the C-shaped part of the iron pillar is upward, the yoke and the iron pillar are respectively inserted in central holes of two skeletons, the end surface of the yoke is aligned with the end surface of the iron pillar; a gasket is arranged between the two end surfaces, an inductive capacitor is respectively coiled on two skeletons, the two ends of the pole plate of the inductive capacitor are respectively fixedly connected with a wire; the yoke and the iron pillar are fixed on a pedestal through a fixing strap by screw nuts; and the space between the two wires of the inductive capacitors simultaneously has capacitance and inductance therebetween to form a voltage resonance circuit. The inductance of the frequency-sensitive filter can be regulated by changing the thickness of the gasket, so as to change the resonant frequency to meet the filtering requirement. The invention has the advantages of simple structure, small volume, high efficiency, low loss, wide filtering range, and low cost; and is particularly suitable for filtering and compensating under the rapid change of the harmonic wave content in a power grid, and can effectively eliminate harmonic wave and clean power grid environment.