The invention discloses a spring composite disc automatic assembling system and method. The defects that spring composite disc assembling is low in automation degree and operation efficiency, and highin labor intensity and defective rate are overcome. The whole assembling process of spring composite discs is automatically completed, a plurality of sets of spring selection devices can transport different types of springs, and assembling of different types of spring composite discs is facilitated. Branch pipes on a discharging mechanism of the two sets of spring selection devices correspond tospring positioning columns on spring positioning tools according to the structure requirements of the spring composite discs needing to be produced, and the production requirements of the spring composite discs are met. The spring positioning columns are arranged for accurately positioning the springs, and the assembling accuracy of the springs and spring discs is ensured. The spring composite disc automatic assembling system can achieve automatic assembling, detection and boxing operation of the spring composite discs, the automation degree is high, the operation efficiency is improved, the labor intensity is relieved, mistaken assembling is avoided, and the defective rate is lowered.