The utility model relates to the field of medical instruments and especially relates to a conveying mechanism for a digestive endoscope. The conveying mechanism comprises a fixed pneumatic clamp, a movable pneumatic clamp, a nut seat, a driving motor, a motor fixing plate, a limiting plate, a transmission mechanism and a spring pressing plate mechanism. A linear guide rod and a leading screw are arranged between the motor fixing plate and the limiting plate. The leading screw is connected with the driving motor via the transmission mechanism. The nut seat sleeves on the leading screw and the linear guide rod. The fixed pneumatic clamp and the movable pneumatic clamp are respectively arranged on the motor fixing plate and the nut seat via the spring pressing plate mechanism. Air is alternatively inflated into the fixed pneumatic clamp and the movable pneumatic clamp. The movable pneumatic clamp is driven by the driving motor to convey when clamping the digestive endoscope by air inflation. When the fixed pneumatic clamp clamps the digestive endoscope, the movable pneumatic clamp is driven to go back via the counter-rotating driving motor. The fixed pneumatic clamp and the movable pneumatic clamp are of integral structure or of split type structure. A force-measuring sensor is also arranged on the movable pneumatic clamp. The conveying mechanism for the digestive endoscope has following beneficial effects: by adoption of a pneumatic clamping mode, the digestive endoscope is simulated to be conveyed by a human hand; and the conveying mechanism is simple in structure and is capable of preventing infection and radiation.