The hydraulic metal baler uses a single pump to start, and a combination of manual and automatic. The power part adopts a large flow and high pressure variable plunger pump. The system is controlled by electrical appliances to achieve system pressure and load functions. A large-diameter hydraulic reversing valve is used to control the forward and backward of the cylinder; it adopts a slow start mode, which is stable, no impact, safe and reliable when reversing. The hydraulic metal baler is mainly suitable for metal recycling companies, copper, iron, and aluminum factories. It can improve work efficiency, reduce labor intensity, reduce transportation costs and save space. It is a perfect equipment for steel plants to increase production.