Pneumatic valve

The invention discloses a pneumatic valve comprising an upper cylinder sleeve, a lower cylinder sleeve, a valve body and a drive mechanism. The upper cylinder sleeve is provided with an air inlet, the lower cylinder sleeve is connected to the upper cylinder sleeve to form an internal cavity and is provided with an air outlet, and the lower end portion of the lower cylinder sleeve is provided with an opening; the valve body comprises a valve rod and a valve head, and the valve rod penetrates the opening and extends into the cavity; the drive mechanism comprises a spring, a piston and a fixing mechanism, the spring sleeves the valve rod, the piston is arranged at the end of the valve rod, the diameter of the piston is equal to that of the cavity, and the piston is fixed to the end of the valve rod through the fixing mechanism. The pneumatic valve is simple in structure, convenient to install and low in cost; meanwhile, high pressure air is adopted as the power source, and the pneumatic valve is easy to control in the using process accordingly.