The invention relates to a large thin-walled component complex curved surface mirroring processing method, and belongs to the technical field of large thin-walled component processing, and especiallyrelates to a large thin-walled component complex curved surface mirroring processing method. An employed processing device is laid in a bilaterally symmetrical structure, the specially-produced processing device is employed to carry out measuring and mirroring processing, a line laser sensor is employed to measure a workpiece, a current vortex sensor is employed to measure displacement with respect to the workpiece surface, and a piezoelectric transducer is employed to measure the value of a support force. Noise removal, data compaction, data splicing are carried out on measured data, and a target curved surface is generated. Processing path planning and support path planning are carried out, a local normal vector and a dynamic support force are measured, and mirroring milling is carried out. According to the invention, after once clamping installation, measuring and mirroring processing can be carried out on the thin-walled component, and the large thin-walled component complex curvedsurface mirroring processing method is good in measuring real-time performance, high in accuracy and convenient to use. Accurate milling of thin-walled components can be achieved, the processing precision is high, and the surface quality is high after processing.