The three-dimensional (3D) polarization-dependent optical property is one distinctive characteristic of the anisotropic metal nanoparticles. This has the potential applications in 3D polarization information encryption to detect the polarization information and single particle 3D orientation determination. Previous studies almost focus on the condition that the polarization orientation is in-plane. In the present paper, we systematically investigate the 3D polarization-dependent near- and far-field properties of a kind of fascinating anisotropic nanoparticle, i.e., gold nanostar (AuNS). It shows that the scattering spectra of the AuNS induced by arbitrary incident polarizations can be described as a linear superposition of a set of basic scattering spectra. And we introduce a trigonometric equation to reveal the inherent relationship between the scattering intensity and the 3D polarization orientation, which is universally independent of the size, shape, or surrounding medium of the nanostar. Furthermore, it is facile to synthesize AuNS with two pairs of orthogonal different-length arms, based on the 3D polarization dependence of the scattering trait, and using coordinate transformation, we have demonstrated that such AuNS is useful for designing single particle 3D orientation and rotational tracking sensor and orientation-unlimited polarization information detector. And the self-rotation problem of the gold nanorod, i.e., rotation around the gold nanorod’s long axis cannot be resolved, can be solved by replacing it with AuNS. In addition, the precision of the 3D polarization angles and 3D orientation angles confirmed by our method is only with subdegree uncertainty.