The invention discloses a plane fuel tank inspecting robot based on a connector structure and a control method thereof. The robot comprises a moving platform, a lifting movement unit, a snake-arm movement unit, a system control unit and a power module. The robot is a bionic robot, can enter a plane fuel tank under the monitoring of working staffs to carry out internal-leaking-point determination and corrosion inspection, has excellent bending performance which does not exist in the traditional discrete type robot, can change the self shape flexibly according to the condition of environmental obstacles, and has unique adaptability to the environment with narrow working space and the non-structured environment. The robot can replace a person for operation in the fuel tank, the working intensity of air crew is reduced, the personal safety is ensured, the maintenance efficiency is increased, and the potential safety hazard of the fuel tank is reduced, therefore, the robot has the important significance in shortening the field stopping time of the plane and reducing economic loss. In addition, almost no electric equipment is arranged on the parts of the robot, extending into the plane fuel tank, so that the anti-explosion precondition is good.