<p>In order to explore the influence of particle shape on the reflux performance in mining lifting pump, the CFD-DEM coupling method was used to numerically simulate the solid–liquid two-phase flow in the mining lifting pump, and the effects of spherical particles, square particles and cylindrical particles on the reflux characteristics in the pump were compared and analyzed. The research results show that when the reflux occurs in the pump, the high-speed particles are mainly distributed at the inlet of the first-stage and second-stage impellers and the outlet of the first-stage guide vane. The accumulation phenomenon mainly occurs on the pressure surface of the guide vane blade and the junction between the impeller and the guide vane. When particles of different shapes reflux in the pump, the distribution area of the spherical particles in the first-stage and second-stage impellers is the smallest, followed by the cylindrical particles, and the largest is the square particles. The accumulation phenomenon of the spherical, cylindrical, and square particles in the pump gradually extends toward the impeller passage in turn. In addition, the average velocity of the particles decreases in the order of spherical, cylindrical, and square particles, and the total number of collisions of the particles increases in the order of spherical, cylindrical, and square particles. The time required for the spherical particles to reflux through the pump is the shortest, and the time required for the non-spherical particles to pass through the pump is similar, with the square particles having the lowest passage rate of 43.98%. These factors cause the reflux performance of the spherical, cylindrical, and square particles to decrease in order.</p>