The invention discloses an anti-collision mechanism of an aircraft fuel tank, relating to the technical field of the aircraft fuel tank, comprising an aircraft fuel tank body, wherein a fixing mechanism is fixedly installed on the right side surface of the aircraft fuel tank body, and a cushioning mechanism is fixedly installed on the right side surface of the fixing mechanism. The collision avoidance mechanism of the aircraft fuel tank, because the first slide rod is provided and usedin conjunction with that first slide rord, the second slider can move more conveniently, avoiding the problemof catching the second slider in motion, however, by provide with a baffle, the second slide rod can be effectively prevented from slipping off the second slide ring, The movable plate move more smoothly, so that that cushion mechanism is provide, The external store auxiliary fuel tank is prevented from bee damaged by bird impact, fuel leakage and other conditions that affect the safety of the aircraft, the safety performance of the device is improved, and through the fixing mechanism, the buff mechanism can be disassembled and inspected more conveniently, the buffer mechanism can be preventedfrom being damaged, and the safety hidden danger of the device can be avoided.