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The invention discloses an ultrasonic zoning excitation auxiliary rock breaking device which comprises a rock mass inherent frequency zoning detection system and an ultrasonic zoning excitation system, the ultrasonic zoning excitation auxiliary rock breaking device is installed on a rock drill through a cylindrical fastening propelling device, and a hydraulic propelling device ensures that a compaction sector ring is tightly attached to a rock mass; the rock mass inherent frequency partition detection system performs annular partition amplitude detection on the surface of a rock mass through a compaction sector ring, data is transmitted to an amplitude data collection system and an inherent frequency analyzer, and inherent frequencies of all partitions are determined and transmitted to an ultrasonic generator; high-frequency alternating currents with different frequencies are input into the ultrasonic generator, the high-frequency alternating currents are input into the ultrasonic transducers which are annularly arranged and mutually independent through the circuit control system according to the frequencies, and vibration generated by the ultrasonic transducers is concentrated to the compaction sector ring at the top end through the amplitude-change pole. And performing partition excitation of different frequencies on the construction rock mass. Therefore, large-range and high-efficiency excitation of the rock mass is realized.