Abstract: Due to the irregular broken shape of fine-grained diamond powder and the large difference in linear expansion coefficients between the diamond and filler metal, residual stress is prone to occur at the interface of diamond tools during brazing, which seriously affects the machining performance of the tools. To analyze the residual stress distribution of diamond powder after brazing in detail, finite element simulations were conducted on diamonds with different shapes (spherical, regular dodecahedron, and trapezoidal body). The residual stress distributions in the bonding zones of these three diamond shapes were simulated. Meanwhile, the actual residual stresses at the bonding interfaces of the three diamond powder shapes after brazing were measured using Raman spectroscopy to verify the accuracy of the established model. The numerical simulation results indicate that the residual stress of the three types of diamonds extends gradually from the sidewall bonding zone and the intermetallic compound bonding zone to the interior of the filler metal and steel substrate. Through detailed cross-sectional analysis, the residual stress of the trapezoidal diamond is the largest, while that of the regular dodecahedron diamond is the smallest. Based on Raman spectral peak shift calculations, all three forms of diamonds are subjected to tensile stress. The residual stress of the trapezoidal diamond after cooling is approximately 552.36 MPa; that of the spherical diamond is approximately 413.19 MPa, and that of the regular dodecahedron diamond is approximately 288.19 MPa. The deviation between the numerical simulation values and the measured values ranges from 3% to 25%.