The application discloses a quantum communication network, a method and a communication site thereof. In the quantum communication network, a center communication site comprises a quantum communication terminal and a quantum communication server, a secondary communication site comprises a quantum communication terminal, a photonic device, and optical switches; an IN port of each optical switch canpoint to the OUT port of a local optical switch or the local photonic device under the control of the quantum communication server, wherein the quantum communication server is used for performing thecorresponding switching operation through all optical switches on a line between the center communication site and a target secondary communication site, thereby constructing a quantum communicationlink between the center communication site and the target secondary communication site; the quantum communication terminal of the center communication site is used for acquiring a quantum key corresponding to the target secondary communication site from the local key storage space, and the corresponding quantum encryption communication is performed between the quantum key and the target secondarycommunication site. Through the quantum communication network disclosed by the application, the effects of reducing the amount of the quantum communication terminal in the control center and reducingthe amount of the fiber core are achieved.