The invention relates to a curved incremental launching construction technology for 48m-long-span railway simply-supported box girders and high piers. According to the curved incremental launching construction technology disclosed by the invention, under the condition of crossing over a high-speed railway, the structural temporary prestressing tendons, the design of guiding girders and the reasonable connection with the box girders are optimized, so that the incremental launching construction of railway box girders without support piers between 48m span and capable of safely crossing over high-speed railways is realized; a displacement control and monitoring method in the incremental launching process of curved single-span simply-supported box girders is established, so that synchronous lateral horizontal displacement deviation correction of incremental launching multiple points on curves of the railway curved box girders is realized, in the curved incremental launching process, the lateral horizontal displacement deviation of girder bodies of the box girders is always under a controlled condition; in the incremental launching process, the movable attitude of the girder bodies is right, and the deviation value is controlled in an allowed range; and an analog simulation method is adopted to analyze various adverse stressed state working conditions of the box girders and the guiding girders in the incremental launching process, and a pier-girder structure system of a temporary high pier-trestle bridge is optimally designed, so that in the incremental launching process, the pier top horizontal force is effectively reduced, the incremental launching construction process of the high piers is safe and smooth, and the technical research target of the topic is realized.