CNC quadrilateral plate bevelling machine is processing equipment which is finished in four side up-down bevel and truncated edge in one time plate feeding.When the plate lifting to the conveying platform, to input parameters into the CNC system, the plate feed to milling unit and lock in place, and the plate is centring and positioning automatically and to draw plate to end of the machine in processing the end of the bevel. After finished the end bevel to transport the plate in processing up and down bevel and truncated edge.Once four sides can be beveled and ensure the four sides of plate in verticality and the length of the accuracy. Two diagonal error is 2 mm (for10M length plate).