The invention discloses a dry type hollow electric reactor encapsulation gap crawling robot and a use method thereof, and belongs to the technical field of robots. The crawling robot comprises a robotfixed part, a robot moving part, a twisting spring, a central shaft body, follower wheels, motor driving wheels and a hollow cup motor. The specific position of the crawling robot which crawls between electric reactor encapsulation gaps can be accurately controlled through the hollow cup motor. The robot moving part and the robot fixed part are extruded by an electric reactor encapsulation, and the pressure is transmitted to the twisting spring for compressing the twisting spring, and then the volume of the robot can be freely adjusted, so that the robot can still shuttle and crawl when the encapsulation gaps are changed. The crawling robot is light in weight, small in size and low in cost, and is high in reliability in application to the detection of micro-cracks of the electric reactorencapsulation gaps.