The invention discloses a disordered alloy micro-spring, and a preparation method and a lighthouse thereof. A spring structure is in a screw shape, and integral dimension is in a level from hundred micrometer magnitude to millimeter magnitude; the material is a Ni-Nb-based disordered alloy material, young modulus is larger than 180 GPa, and elastic limit is larger than 2%. A preparation method comprises: (1) preparing a PMMA photoresist cylinder; (2) clamping the photoresist cylinder on the lighthouse for X-ray exposure; (3) carrying out development, and preparing a PMMA mould of the spring after development; (4) melting nickel and niobium metals under vacuum and argon protection to form a target material; (5) preparing a disordered alloy thin film layer by magnetron sputtering; and (6) releasing to obtain the disordered alloy micro-spring. An X-ray photoetching process and a magnetron sputtering technology are combined, which breaks a dimension bottleneck of a submillimeter spiral minisize spring prepared by a traditional mechanical technology, fills a vacancy of the disordered alloy spiral micro spring in an MEMS device, develops processing thinking of a 3D metal micro-device, and makes the micro spring have a flat and smooth surface and an ideal shape.