In order to help cataract patients obtain a better visual experience with the intraocular lens implantation, which form a clear image on the retina in the far, intermediate and near vision synchronously, we design a trifocal intraocular lens with freeform-Fresnel surface. Each individual focal length is controlled by several different Fresnel zones, which can avoid the focal point disappearing with pupil contraction. Based on the vector form of refraction law, the Fresnel lens with freeform surface is designed by iterative computation, and the energy distribution at different focal points is simulated. Afterwards, we construct the trifocal intraocular lens with freeform-Fresnel surface in the eye model of ISO 11979-2, of which the additional power of the focal length is +1.66 D and +3.32 D, respectively. By ray tracing, the modulation transfer function of the system at different focal point is obtained. It is clear that the modulation transfer function is greater than 0.2 at the spatial frequency of 50 lp/mm for all focal points, which meets the daily vision demand of cataract patients.