Abstract: A pneumatic pump has a valve body having a piston compartment and a receiving compartment, wherein a piston is slidably and sealedly disposed in the valve body to move between a first position and a second position. The valve body also has an exit opening communicating with the piston compartment and a resilient element to help pushing the piston to the first position. An actuator pumps air into the piston compartment and pushes the piston to the second position. The pneumatic pump further has a valve control which has a sealing member sealedly formed at the piston compartment, a driving member which is connected to the exiting opening, wherein a pressure drives the driving member automatically to unseal the sealing member to release the air inside the piston compartment to a releasing cavity and eventually allows the piston to move back to its original position.