To enhance the efficiency and capability of lithium foil detection based on the rolling process,a three-dimensional scanning and reconstruction techniQue based on wavelet analysis is proposed.This techniQue employs a laser displacement s en- sor combined with a scanning plate measurement method to achieve rapid and highly accurate data collection of the lithium foil I s shape characteristics.Building upon wavelet analysis,the laser rangefinder scanning measurement data,after removing gross errors,is subjected to wavelet coefficient threshold denoising,accomplishing noise reduction while preserving the integrity of the original measurement data.Finally,the shape is reconstructed using a point-by- point insertion method.Measurements of the same rolled piece using both the three- coordinate measurement method and the laser scanning plate reconstruction detection method proposed in this paper are compared.The results indicate a maXimum difference of 0.004 mm between the two meth- ods.utilizing the detection method proposed in this study,siX repeatability tests were conducted on the same rolled piece,showing a maXimum standard deviation of 0.001 47 mm and a repeatability error less than 士 0.003 mm.The research results validate that the laser scanning plate shape reconstruction detection method proposed in this paper has high precision and consis- tency,meeting the reQuirements for lithium foil detection.