This paper proposes a phase-controllable polarization-preserving scheme by adjusting Goos-H?nchen displacement based on the optical tunneling effect. First, two dielectric films (i.e., films 1 and 2) are coated outside a corner-cube reflector's reflective plane. Then, the refractive index and thickness of the dielectric film are optimized through particle swarm optimization (PSO) method to realize the incident light, which can be totally reflected at the interface of the corner-cube reflector and the dielectric film. The evanescent wave returns to the corner-cube reflector through the film 2. The polarization preservation can be achieved using the superposition effect of the reflected beam and the evanescent wave to change the propagating beam phase. Finally, COMSOL Multiphysics simulation software is used to simulate the polarization preservation effect of the corner-cube reflector. Simulation results show that when the initial azimuth of the incident polarized light is in the range of [-40°,40°], it exhibits better preserved polarization, i.e., the azimuth angle and the ellipticity of the emitted light are varied by approximately 0.2° and 0, respectively.