Cattle bloodletting automatic line is suspended assembled, and is generally composed of driving part, tightening part, carriage driving wheel and chains. When the living cattle behind the pushing board is hung on the suspended line, it can be used by the operators to conduct the bloodletting and pre-cutting of the rear legs. This machine is high in the mechanical and automatic degree, so it greatly reduces the human labor and improves productivity. It is one of the indispensable equipment of batch slaughtering in the slaughter workshop.