Reflection cracks are one of the main diseases of composite pavements. In order to explore the crack propagation path and the propagation law under different conditions, this paper uses the Extended Finite Element Method (XFEM) in ABAQUS software to simulate and analyze the crack propagation law in the asphalt concrete semi-circular bending fracture experiment. By comparing the experimental and numerical model data of others, the effectiveness of the XFEM-based finite element model in analyzing crack propagation is verified. In addition, this paper establishes a 2D model of dry oil stone separation and regeneration composite pavement, and studies the influence of construction joint width, prefabricated crack length, deflection angle, and preset position on the stress at the crack tip. The results show that the stress at the crack tip increases with the increase of crack length and deflection angle, and shows a decreasing trend first and then an increasing trend with the increase of construction joint width, while it first increases and then decreases with the increase of offset distance. The results of this paper are helpful for the quantitative analysis and characterization of reflection cracks in composite pavements, and provide reference and basis for the design and later maintenance of composite pavements.