The invention discloses a production method for a null line grounding type filter. The method comprises the following steps of S1, designing a filter coil into a structure of a passive harmonic current bypass channel and designing an LC capacitor into the structure of a three-point type oscillator circuit; S2, producing the filter coil and the LC capacitor according to the design scheme of the S1 and assembling the produced filter coil and LC capacitor, thereby finishing basic construction of a filter IC; S3, smelting functional graphene and liquid metal in a vacuum smelting furnace, uniformly mixing the functional graphene and the liquid metal to obtain filter media, pouring the filter media into the filter coil, and carrying out heating and solidification to obtain the filter IC; and S4, packaging the filter IC to obtain the filter with a null line grounding type filter function. According to the filter produced by the invention, bypass and passive circuit structures are employed, so the pressure problem is avoided, the use is safe and convenient, the installation is convenient, an application range is wide, a harmonic effect is good, and a zero harmonic approximate effect is achieved.