This assembly line has replaced the previous curbstone mainly relying on artificial chamfering and polishing, which completely solved the situation of high labor intensity, low efficiency, and high cost. The entire assembly line is seamlessly connected, the linkage between the devices is achieved by the intermediate transition frame and the flap frame device. The chamfering position adopts the popular lower chamfering degree, the chamfering precision is high, and can be chamfer rounded corners, at the end of the addition of polish, achieved the rounded corners of the polish problem.