ing at the shortcomings of traditional laser resonator composed of flat or spherical mirrors that require high precision adjustment and allow a small rotation misalignment angle, the Luneburg lens and spherical total reflection surface are combined as beam retroreflective devices. We performed numerical simulations on the reflection characteristics of the retroreflector under different incident angles of Gaussian beams and different distances between the central axis and the optical axis of the Luneburg lens. The results demonstrate that even when the linearity is as small as one-tenth of the wavelength of the light wave, the reflectors can still achieve good directivity and retroreflection with stable reflected amplitude for incident Gaussian beam distributed in a large range in the angular and lateral direction. Therefore, it is theoretically feasible to use it as a laser optical resonator mirror, and it has the advantages of low adjustment requirements, large cavity length lateral, and angular movement range. And the size of the retroreflector is small, which is easy to realize the miniaturization of the resonator mirror.