The utility model relates to a full-automatic straw placing machine. The straw cutting machine comprises a main rack, a straw guide mechanism fixed to the main rack and a straw cutting main machine. Amain machine mounting plate is arranged on the straw cutting main machine; a bobbin arranging mechanism, a feeding mechanism, a cutting mechanism and a discharging mechanism are sequentially arrangedon the main machine mounting plate. Wherein the straw guiding mechanism is arranged on one side of the straw arranging mechanism, the feeding mechanism is arranged on the other side of the straw arranging mechanism, the straw cutting main machine is further provided with a positioning mechanism, the positioning mechanism is arranged on one side or two sides of the cutting mechanism, and the feeding mechanism and the positioning mechanism are provided with pressure adjusting mechanisms capable of adjusting the height. The cutting device is reasonable in layout and capable of achieving accuratecutting.