During the progressive blasting process of tunnel drilling and blasting method, it is inevitable to cause damage to the rock mass. The cumulative damage of rock mass originates from the continuous dynamic response of rock mass. At present, there is still no quantification method to calculate the cumulative damage of surrounding rock subjected to the successive blasting of tunnel each subsection and the repeated blasting of tunnel propulsion. Relying on a tunnel project, a method is proposed to simulate the successive blasting and progressive repeated blasting of each tunnel subsection, and the cumulative damage extent caused by each working condition to surrounding rock is quantified. The feasibility of this method is proved by field test data. The results show that:1) when calculating the damage simulation of large-scale blasting, it is advantageous to use equivalent load to simulate blasting load;2) the surrounding rock damage induced by single-cycle footage excavation of the tunnel is caused by the superposition of multiple stages of delayed blasting, which is mainly affected by the adjacent auxiliary blasting;3) the blasting excavation of multi-cycle footage will also induce the accumulation of surrounding rock damage, and the accumulation process is mainly affected by the current blasting footage and the previous blasting footage;compared to the single-cycle footage,the cumulative damage extent of the tunnel middle side wall caused by the multi-cycle footage increased by 26.7%.