The invention discloses a bunker dredging system with an arch breaking cap using a resonance method, which comprises an automatic reversing device, an excitation power device and a main vibrator device. The power output end of the automatic reversing device is in hydraulic or pneumatic transmission connection with the power input end of the excitation power device through a pipeline (11); the power output end of the excitation power device is in transmission connection with the reversing valve plug (9) of the automatic reversing device; and the power output end of the excitation power device is in hydraulic transmission connection with the main vibrator device through a pipeline (22). The system has the advantages of reasonable design, simple structure, pure mechanical operation, safety and reliability, labor saving, capability of solving the dredging problem after arch formation, and capability of creating excellent production benefit and social benefit for mine enterprises.