The arrangement device for battery pack production welding comprises a conveying belt, racks are erected on the two sides of the conveying belt correspondingly, guide plates are fixedly connected to the positions, located at the tail section of the conveying belt, of the two racks correspondingly, and a supporting plate is fixedly connected between the tops of the ends, away from the conveying belt, of the two racks; a U-shaped material taking frame is movably connected to the side, close to the conveying belt, of the supporting plate, a first push plate and a limiting plate are arranged in the U-shaped material taking frame, an L-shaped flow limiting plate is rotationally connected between the ends, close to the U-shaped material taking frame, of the two flow guide plates, and a second push plate is detachably connected to the upper portion of the U-shaped material taking frame. According to the device, the U-shaped material taking frame used for receiving materials is arranged at the tail end of the battery conveying belt, the U-shaped material taking frame is in butt joint with the tail end of the conveying belt, the batteries on the conveying belt can enter the U-shaped material taking frame, the batteries are tightly connected due to mutual extrusion, and only the positions of a small number of batteries need to be manually adjusted subsequently; and the machining efficiency of battery welding is greatly improved, and the labor intensity of workers is reduced.