Porous metal sandwich structure has light weight, high specific strength and stiffness, high temperature and corrosion resistance, sound dissipation, heat insulation and other excellent properties. The application of high-end equipment in the aerospace field is receiving more and more attention. Brazing is the preferred method to realize the joining between core and face sheets of porous metal sandwich structure. However, the process of large area brazing of  core and face sheets is prone to defects such as melting of brazing filler to thin-walled base metals, low brazing rate, large brazing deformation and formation of continuous brittle reaction products at the interface, so large area brazing of porous metal sandwich structure is still difficult, and basic research on brazing of porous metal sandwich structure is urgently needed. Scholars at home and abroad pay attention to the adjusting of joining interface micro-reaction products for the type and distribution, dissolution prediction of thin-walled base metals, welding heat deformation control of thin-walled  core and other challenges. The study about new methods of brazing interface microstructure control, brazing process– morphology of brazing fillet–microstructure of brazed joint–the mechanical properties of the joint was conducted to clarify the microstructure evolution of the brazed joint and optimize the mechanical properties of the joint. It has important scientific significance and the value of application. The progress of domestic and international research is reviewed in terms of the interface micro-zone control of the brazed joint of the metal porous sandwich structure, the micro-morphological design of the brazed joint based on the optimization of mechanical properties, the effect of the brazing process on the mechanical properties of the structure, and the predictive model for dissolution of base metals in molten brazing filler metal, respectively.