The invention relates to an intelligent assembly system for machining brake assemblies. The intelligent assembly system comprises a circulation type assembly conveying line, wherein a feeding mechanism, a spring mounting mechanism, a grinding mechanism, a turnover mechanism, an iron core dismounting mechanism and a discharging mechanism are sequentially distributed along the conveying direction ofthe assembly conveying line, the assembly conveying line is further provided with at least one manual assembling process, at least one assembly tool is further arranged on the assembly conveying line, and the assembly tool flows among the mechanisms along with conveying of the assembly conveying line. The system has the advantages that circulation of the assembly tool is realized through arrangement of the circulation type assembly conveying line, in addition, the feeding mechanism, the spring mounting mechanism, the grinding mechanism, the turnover mechanism, the iron core dismounting mechanism, the discharging mechanism and the manual assembling process are matched, so that semi-automatic assembling and polishing of brakes is realized, the manual labor is greatly reduced, and the working efficiency is correspondingly improved.