Aiming at the problem that 2D image processing cannot extract the 3D features of the tool wear area in the current tool wear detection,a method based on structured light projection technology was proposed to extract the 3D feature information of the tool wear area.The obtained 3D point cloud information was segmented to separate the gasket point cloud in the tool from the cutter head point cloud.The gasket point cloud was processed by least square fitting plane,the maximum distance between the fitted plane and some point clouds of the cutter head was calculated,and the actual physical distance was converted with a standard gauge block.Finally,the maximum actual wear of the cutter head was obtained,providing data reference for workers to replace the cutter head.The research results show that in the process of quantifying the wear area of the turning tool,the method can obtain the specific wear value of the turning tool head with high accuracy and low economic cost.The error of the system is less than 0.05 mm,which can meet the actual production needs.