An ultrasonic cutting machine was used to automatically net-dimension chamfer-cut prepreg laminate. A comparative study was conducted on the surface quality and contour dimensions of the laminate cut by different cutting paths, cutting angles, ‘normal-cutting’ and ‘contrary-cutting’, cutting rates, and thickness of prepreg. The results show that ‘pressing fiber’ cutting model can improve the surface quality of chamfer-cutting. 45° chamfer-cutting can provide a stabler cutting quality and profile accuracy, and be better for designer to distribute fasteners. To ensure the contour accuracy of the laminate during cutting, the normal-cutting model is used. Taking into account the cutting quality and cutting efficiency comprehensively, a cutting feed rate of 300 mm/min is more appropriate. Under different cutting feed rates, the 30° and 45° chamfer-cutting of laminate of different thicknesses exhibit their own rules.