Optical system and VR device

The invention provides an optical system and VR equipment. The optical system comprises a display unit, a first lens, a second lens, a polarization light splitting assembly and a phase delay assembly, the display unit, the first lens, the second lens and the polarization light splitting assembly are arranged in sequence, and the phase delay assembly is arranged between the first lens and the polarization light splitting assembly; the display unit provides a light source; the surface, back on to the display unit, of the first lens is a partially reflective surface; the focal power of the first lens near the axis is negative, and the focal power of the edge of the first lens is positive; the focal power of the second lens at a paraxial position is positive; a focal length ratio of a focal length of a center field of view of the optical system to an average radial focal length of N edge fields of view of the optical system is greater than 1.5. In this way, the PPD of the central area of the human eyes can be greatly improved.