In view of the fact that the arc surface is mainly smoothed manually in the production process of concrete segments,a three-axis linkage automatic leveling equipment was designed.According to the way of manually smoothing the concrete surface,the interpolation movement and tool angle adjustment of the arc surface were realized through two linear axes and one rotation axis.In the electrical control system,GSK25iMB CNC system was taken as the core,and the time division interpolation method was used to carry out the arc interpolation calculation to realizes the automatic smoothing of the circular arc surface of the concrete segment.The path planning of arc surface was carried out by using UG to ensure the tool path coverd the whole arc surface.The field experiment was carried out.The results show that the surface of the concrete segment is smooth without concave and convex,which meets the precision requirements of production;by using the equipment,the production efficiency of concrete segment is greatly improved.