The embodiment of the present invention discloses a modulator circuit and an implementation method thereof. The modulator circuit comprises a multi-level modulator; the first-level modulator circuit of the multi-level modulator adopts a continuous time structure, and the successive-level modulator circuit adopts a switching capacitance structure. In the modulator circuit, a modulation technology of partial CT loop filter is applied in an SC loop filter, thus the modulator circuit prevents the defects of the CT filter, reduces the power consumption of the SC filter, and improves the applicable frequency range of the SC filter.