Abstract: In order to solve the problems of low efficiency and poor quality of the inspection of defects on the metal liner of hydrogen storage cylinders, an integrated inspection system combining eddy current inspection with video inspection and equipped with an automatic sweeping mechanism was developed. The system was modular in design and consisted of an integrated inspection device, a travel mechanism, a center alignment mechanism, a bottle placement device and a control box, etc. It was compact and easy to disassemble. The system enabled spiral sweeping of the inner liner surface of the cylinder body section, simultaneous storage of eddy current inspection data and video image data, and can locate the actual position of the defect based on time information. The test results showed that the system not only had a high defect detection rate, but also met the requirements of automatic sweeping in industrial inspection, and improved the efficiency of detecting surface defects on the inner liner of hydrogen storage cylinders.