This paper aims to analyze the flow field of remanufactured powder on the inner wall of hydraulic support cylinder, which is helpful to improve the repair efficiency and reduce the repair cost. When laser deposition technology was used to repair the inner wall of the hydraulic support cylinder, the powder flow concentration of lateral powder feeding was an important factor in improving the surface repair efficiency of the hydraulic support cylinder. The model of the long-distance powder feeding nozzle used to repair the inner wall of the hydraulic support cylinder body was established. Based on the DEM-CFD gas-solid two-phase flow coupling model, the influence of the powder feeding process parameters (carrier gas velocity, shielding gas velocity, powder feeding rate) on the agglomeration of powder flow was analyzed separately under the condition of the constant pose of the powder feeding nozzle. The research showed that as the speed of the carrier gas increased, the density of the powder flow per unit volume at the intersection of the powder flow and the laser showed a trend of first increasing and then decreasing. The distribution diameter of powder flow showed a trend of first decreasing and then increasing. As the speed of the shielding gas increased, the density of the powder flow per unit volume at the intersection of the powder flow and the laser showed a trend of first increasing and then decreasing. The distribution diameter of powder flow showed a trend of first decreasing and then increasing. As the powder feeding rate increased, the concentration of the powder flow per unit volume at the intersection of the powder flow and the laser became larger. The distribution diameter of powder flow showed a trend of first decreasing and then increasing. From the regression model of powder flow concentration per unit volume, it can be seen that when the carrier air velocity is 4 m/s, the shielding gas velocity is 3 m/s, and the powder feeding rate is 5 g/min, and the powder flow accumulation effect is good. At this time, the utilization rate of powder is high, which helps to improve the repair efficiency of the inner wall of the hydraulic support cylinder.