The invention relates to the technical field of low-pressure gas well yield-increasing transformation and reservoir protection, in particular to a low-damage well killing fluid for a low-pressure gaswell and a preparation method of the low-damage well killing fluid, and the low-damage well killing fluid comprises the following components in percentage by weight: 10-20% of degradable temporary plugging particles, 4-6% of a carrying liquid, 3-5% of a releasing agent and balance of water. According to the invention, low-damage well killing operation of the low-pressure gas well can be realized,a liquid phase in the well killing fluid carries solid-phase particles through viscosity increase, liquid filtration loss is reduced, meanwhile, organic and inorganic blockages near a wellbore are cleaned, the solid-phase particles in the well killing fluid form a high-strength and strong-blocking section plug body through a combined bridge frame and self-adhesion, and self-degradation after wellkilling operation is completed. The low-damage well killing fluid can improve the efficiency of workover treatment, reduce the filter loss of the well killing fluid, improve the permeability of a reservoir near a wellbore, and achieve the purpose of increasing the yield of low-damage well killing operation of the low-pressure gas well.