  The dark photon is a new gauge boson which arises from an extra U'(1) gauge
symmetry. In this paper, a novel dark photon production mechanism based on
MeV-scale $\gamma$-$\gamma$ collider is considered: $\gamma \gamma \rightarrow
\gamma A'$. With the aid of PACKAGE-X, differential cross section of $\gamma
\gamma \rightarrow \gamma A'$ is obtained, as a function of the kinetic mixing
parameter $\varepsilon$ and dark photon mass $m_{A'}$. Take the scattering of
light-by-light as background, the constraints on the dark photon parameter
space for different time intervals in a MeV-scale $\gamma$-$\gamma$ collider
are also given.
