An atomic clock at optical frequency based on atomic beam and a method for generating the atomic clock comprises: The atomic beam (8) is ejected from a pile mouth after heating an atomic pile (1) in a vacuum chamber (2); A laser (4) corresponding to frequency of a clock transition transfers the atomic beam (8) from a ground state of the clock transition to an excited state of the clock transition in a adiabatic passing mode; After interaction with the laser corresponding to the frequency of a clock transition, the atomic beam (8) passes a signal detection region with a detection laser (5), and after the interaction with the detection laser (5), each of the atoms gives off a photon of spontaneous emission; An emitted fluorescence photon signal from atoms which is excited by the detection laser (5) is explored; A clock laser (4) for exploring transition frequency of an atomic clock is modulated. The signal which is detected performs frequency locking for the frequency of the clock laser which is locked on the clock transition spectrum of the atoms so as to implement the atomic clock.
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