Electric blasting based on electromagnetic energy equipment has great application prospects in foundation pit engineering. This article proposes the synergistic rock breaking technology based on pulse power supply and electric explosion load arrays, which achieves controllable electric blasting of large volume hard rock through the superposition of multiple shock waves. The article analyzes the mechanism of overvoltage in the process of electric explosion and the mechanism of overvoltage conduction in the multi-array collaborative process, and proposes the overvoltage suppression method. It compares the rock breaking effects of single pulse power supply and multi-array and the specific energy consumption of the dual load array is 38% of a single load for rock breaking, which indicates the electric explosion load array can effectively achieve controllable electric blasting of large volume hard rocks.