A capacitance phase interpolation circuit including a first capacitance phase interpolation unit and a second capacitance phase interpolation unit is disclosed. The first capacitance phase interpolation unit includes a first capacitance group, wherein a plurality of capacitors in the first capacitance group are in a ring coupling, and the first capacitance phase interpolation unit receives a plurality of reference clock signals. The second capacitance phase interpolation unit is coupled to the first capacitance phase interpolation unit and includes a second capacitance group, wherein a plurality of capacitors in the second capacitance group are in a ring coupling, and each of the output clock signals is obtained via the first capacitance phase interpolation unit and the second capacitance phase interpolation unit by performing phase interpolation on all the reference clock signals.