The invention provides a blue-phase liquid crystal lens with a large focusing range. The blue-phase liquid crystal lens structurally comprises a positive glass lens, an upper substrate, a pixel electrode, an upper dielectric layer, an open electrode, a lower dielectric layer, a liquid crystal layer, an insulating layer, a common electrode and a lower substrate from top to bottom, wherein each of the upper substrate and the lower substrate is a plane glass substrate; each of the pixel electrode and the common electrode is a plane electrode; and both the upper dielectric layer and the lower dielectric layer adopt the same high dielectric material. The maximum phase difference provided by the blue-phase liquid crystal lens can break through the 1/3 saturation induced birefringence limit of the refractive index difference of the blue-phase liquid crystal material, and the minimum focal length of the blue-phase liquid crystal lens is reduced by about one time, thereby greatly increasing thefocusing range of the blue-phase liquid crystal lens.