Boiler pressure vessel leakage detection device and detection method

The invention discloses a boiler pressure vessel leakage detection device and detection method. The device comprises an ultrasonic flaw detector and a probe connected with the ultrasonic flaw detector, wherein one side of the ultrasonic flaw detector is fixedly provided with a plurality of convex blocks, one side of each convex block is externally provided with a hook-and-loop fastener, the bottomof each convex block is provided with a buckle ring, each hook-and-loop fastener is fixed by bypassing the corresponding buckle ring, a switch is arranged at the top of the hook-and-loop fastener, and heat dissipation holes and a fan are arranged on a shell of the ultrasonic flaw detector. According to the invention, the hand of a user is limited to one side of the ultrasonic flaw detector through the hook-and-loop fastener, when the user feels that the ultrasonic flaw detector is hot, the switch is turned on to start the electric fan, the electric fan conveys airflow to fingers of a detectorfor cooling, and part of