The invention discloses a pneumatic balance crane using a pressure difference sensor and a control method. In the device, an air cylinder is connected with the pressure difference sensor, two air pressure input connectors of the pressure difference sensor communicate with the air cylinder, and a closing electromagnetic valve is further arranged between one air pressure input connector and the aircylinder. Through the arrangement of the pressure difference sensor, the changing value of the pressure in the air cylinder in the heavy object carrying process is measured, automatic air feeding andexhausting are achieved through a micro processor, the pressure in the air cylinder and a heavy object are promoted to be balanced, and compared with a traditional pneumatic balance crane, the function of long-distance heavy object carrying can be achieved.