Disclosed is a lamp having a dynamic starry sky effect. The lamp includes a lamp frame, and a first light source, optical integrating lenses, a roller beam splitter, a starry sky laser assembly and a starry sky mirror disc, where the optical integrating lenses are configured to focus light emitted by the first light source into strip-shaped light spots and transmit the strip-shaped light spots formed through focusing to the roller beam splitter at a front part in a shining direction; the roller beam splitter is configured to form the light into nonlinear dynamic strip-shaped light spots during rotation; the starry sky laser assembly includes a second light source; the starry sky mirror disc is configured to reflect light generated by the second light source; and the light dots and the strip-shaped light spots are superposed and combined together to form the dynamic starry sky effect.