The utility model relates to the technical field of assembly line discharging. The utility model discloses a discharging device of an aluminum bar high-speed sawing processing assembly line. The discharging device comprises a discharging frame provided with conveying rollers. Moving holes are symmetrically formed in the two sides of the discharging frame. A supporting plate is fixedly connected tothe discharging frame above the conveying rollers; a rotating hole is formed in the center of the supporting plate; the hole wall of the rotating hole is fixedly connected with a bearing; a rotatingshaft is fixedly connected to the inner ring of the bearing, the two ends of the rotating shaft sequentially penetrate through the bearing and the rotating hole and extend outwards, a gear is fixedlyconnected to the lower end of the rotating shaft, racks are symmetrically meshed with the annular side wall of the gear, T-shaped sliding blocks are fixedly connected to the upper ends of the racks, and T-shaped sliding grooves are formed in the positions, corresponding to the T-shaped sliding blocks, of the moving holes. The distance between the two clamping plates is adjusted according to the size of a discharging aluminum bar, the shaking range generated when the aluminum bar is subjected to propelling force is reduced, and then the aluminum bar is stably conveyed on the conveying rollers.