Abstract: Targeting the requirements of on-site high-energy non-destructive testing on modern aviation engine turbine blades and other military and basic heavy industry products, the accelerator research team at Xihua University has independently designed and developed a core device, the X-band 2 MeV small focus accelerator tube, working with X-band miniaturization accelerator technology. They have also integrated and developed a movable X-band 2 MeV small focus accelerator radiation device. The device integrates several subsystems, including X-band small focus standing wave accelerator tube, magnetron, microwave transmission system, accelerator head made of vacuum system and shielding body, high-voltage pulse modulator, control system, and cooling system. Among them, the small focus acceleration tube adopts a standing wave electric coupling structure, with a length of less than 100 mm, an output energy of 2 MeV, a focus size of less than 0.7 mm, and a dose rate of greater than 40 cGy/min at 1 m. After the successful development of the X-band 2 MeV small focus accelerator, a movable 2 MeV small focus CT system was built based on the device, and the system performance was tested and applied. As a result, the obtained image spatial resolution was significantly better than that of similar S-band high-energy CT products.