Optical path structure, optical display system and virtual reality equipment

The utility model provides an optical path structure, an optical display system, a virtual reality device and a focal power adjusting method, and the optical path structure comprises a first lens group, a second lens group and a third lens group which are sequentially arranged, the ratio of the total focal length of the first lens group and the second lens group to the absolute value of the focal length of the third lens group is greater than 0.1 and less than 6; one side, far away from the third lens group, of the second lens group is sequentially provided with a phase retarder and a reflective polarizer along the direction pointing to the first lens group; and a light splitting film is arranged on one optical surface of the second lens group. By adopting the light path structure provided by the utility model, the lightening and thinning of the whole light path structure can be realized; and by setting the focal length size relationship between different lens groups, high-resolution images under a large field angle can be realized.