The invention proposes an optical circulator. The optical circulator comprises three beam inlet-outlet ports, wherein a beam entering a first port is transferred and oriented to a second port, a beamentering the second port is transferred and oriented to a third port, the light circulator is arranged in a beam transfer path from the first port to the second port and from the second port to the third port, and at least one prism unit with a PBS film is arranged. By the optical circulator, same-direction light giving-out is facilitated, and miniaturization is facilitated.