Pneumatic control loop for controlling finisher and finishing apparatus

The invention discloses a pneumatic control loop for controlling a finisher and a finishing apparatus. The pneumatic control loop for controlling the finisher comprises a positive pressure control branch, a vacuum branch and a switch valve. The positive pressure control branch comprises a pressure reducing valve connected with an air source, and a first control valve connected with the pressure reducing valve and used for selectively disconnecting and connecting with the positive pressure control branch. The vacuum branch comprises a vacuum generation device. The switch valve is connected with the positive pressure control branch and the vacuum branch respectively and is used for selectively connecting one of the positive pressure control branch and the vacuum branch to the finisher. According to the embodiment of the invention, the pneumatic control loop for controlling the finisher has the advantages of being simple in structure and convenient in control.