The invention provides a diopter-adjustable curved surface waveguide near-to-eye optical display device which comprises an image display light source used for providing image information used for observation, a collimating lens set used for collimating optical waves, a PBS (polarization beam-splitting) assembly used for performing polarization beam-splitting on the optical waves, a P&S photo-conversion assembly used for realizing conversion of P light and S light, a P&S beam-splitting selection assembly capable of enabling the optical waves to uniformly cover a coupling input surface, a micro-curved surface waveguide substrate used for performing total-reflection propagation on the optical waves, and a micro-local curvature coupling output surface used for enabling the transmitted optical waves to be coupled and output out of the substrate, expanding a view field angle and adjusting the diopter. The diopter-adjustable curved surface waveguide near-to-eye optical display device has the advantages of adjustable diopter, lightweight, thinness, large view field angle, simplicity for processing and design, easiness for realization, compact structure and high energy utilization rate of an image source, can be used in various fields of remote medical information teaching, virtual reality simulation training, fire rescue information positioning guidance, road enhancement display and the like, and can be used as a display of a terminal.