The invention discloses a damage alarming method for a retaining wall structure system, and belongs to the technical field of retaining wall monitoring. The alarming method comprises the following steps: 1. stimulating a retaining wall instantaneously through an automatic stimulating device; 2. acquiring a retaining wall power response signal through a sensor and transmitting the response signal to a signal receiving device; 3. implementing wavelet packet treatment on the signal received through a computer; 4. analyzing the signal after the wavelet packet treatment, and judging whether the retaining wall is damaged. The method discloses by the invention has the characteristics of high sensitivity, low cost, simplicity and convenience in operation and the like; the method, compared to similar nondestructive diagnosis methods, has an excellent capability of identifying local damage and can effectively alarm damage of the retaining wall; the damage alarming method is widely applicable to various rock retaining structures, and has wide application space in the future.