The present paper establishes the photonic superguiding theory in polar crystals with a high nonlinearity. In the microscopic theory it is shown that photons can feel an attractive effective interaction by exchange of virtual phonons. Such an interaction leads to the superguiding state, in which the photons with opposite wave vectors and spins are bound into pairs. The photon pairs travel without scattering attenuations. In the semiclassical theory we find that polar crystals with a high nonlinearity are self-defocusing media with dispersion and the optical fibers made from such crystals can propagate temporal solitons without dispersion. If the photons propagating in such a waveguide enter the superguiding state, the waveguide exhibits both an ultralow energy loss and a high transmission rate.