Brazing is one of the key basic technologies in the manufacturing industry,and the wide application of composite brazing filler metals is an important method to realize green and automatic brazing. Comparing with the traditional filler metal,composite filler metal can achieve the precise flux reaction under the conditions of accurate positioning,constant temperature,timing and quantification. In this article,the classification and characteristics of brazing filler metals at home and abroad are reviewed,and the preparation technology,compo-sition design and typical applications of flux-cored brazing filler metals,flux-coated brazing filler metals,brazing filler metals prepared by powder are analyzed. The shortcomings of current research are pointed out,and suggestions for the future development of the composite filler metal are put forward. For example,with the aid of materials genome technology,developing low-Ag and Cd-free brazing filler metal with high activity and low emissions;continuously innovating the processing and preparation technology of composite brazing filler metals,such as friction stir processing and electromagnetic plastic technology; developing continuous plate-packed and barrel-packed flux-cored composite brazing filler metals with excellent surface quality to replace traditional manual strip brazing filler metals.