A new method for the composite rolling of 304/Q345R was explored in the present study. The composite interface of the composite plate was studied using a scanning electron microscope (SEM) and electron-backscatter diffraction (EBSD). The results showed that a composite interface was formed with corrugated connections, increasing the length of the composite interface. Furthermore, the elongation of the corrugated interface relative to the original wave interface and the original horizontal interface were 29.43 % and 59.12 %, respectively. The composite interface became a 3D ripple interface from the traditional 2D plane. In the EBSD analysis, the strain energy at the interface of the corrugated composite interface was large, especially in the composite interface of the wave-waist position, indicating that the position of the ripple interface had a large deformation degree. This deformation is beneficial to the interface oxide and broken hardened layer conducive to the interface of the complex.