CVQKD system integrated with microcavity optical frequency comb and implementation method of optical path of CVQKD system

The invention discloses a CVQKD system based on an integrated microcavity optical frequency comb, and the system comprises a transmitting end which generates the optical frequency comb through an integrated microcavity, and modulates an entangled photon pair; transmitting part of the signal light and the idle frequency light to a receiving end, performing homodyne detection on the other part of the signal light and the idle frequency light, and recording a bare code value; carrying out classical communication with a receiving end, sending an encrypted message, and processing a key; the interference end is used for generating interference on communication; at a receiving end, an optical frequency comb is generated by using an integrated microcavity, and entangled photon pairs are modulated; receiving idler frequency light and signal light from a sending end, performing homodyne detection on the idler frequency light and the signal light, and recording a bare code value; and carrying out classical communication