To further investigate the flow characteristics of the ore drawing process of ore-rock with different water contents in steeply inclined extremely thin veins, so as to optimize mining processes and improve resource recovery rates, a combined method of physical tests and numerical simulation was adopted, and a full-scale numerical model of ore drawing in confined space for steeply inclined extremely thin veins was established. Through repose angle calibration tests on ore-rock with different water contents, the discrete element simulation parameters were determined. Full-scale numerical simulations of ore drawing were carried out, and the ore drawing characteristics of ore-rock with different water contents under different ore drawing heights were analyzed. The results show that the water content of ore-rock particles has a significant impact on the flow characteristics of ore-rock. When the water content of ore-rock is 4％, the ore drawing fluidity is optimal with a large and stable flow rate, and it exhibits a “first-in first-out” flow regime. As the water content increases, the ore drawing fluidity distorts and gradually transitions to a “first-in last-out” flow regime, while the ore drawing flow rate decreases, failing to meet the requirements for simultaneous operation of multiple ore drawing outlets. In addition, when the water content of ore-rock is 4％, ore drawing heights have a relatively small impact on the fluidity of ore-rock particles. As the water content increases, the increase in ore drawing heights worsens the fluidity of particles at higher positions, and when the water content is 15％, the particle fluidity deteriorates severely.