Monitoring device for crack propagation life of steam turbine rotor

The utility model discloses a monitoring device for crack propagation life of a steam turbine rotor, and relates to the technical field of steam turbine rotors. The utility model relates to an ultrasonic flaw detector, in particular to an ultrasonic flaw detector, which aims to solve the problems that a user needs to hold the ultrasonic flaw detector by hand when the ultrasonic flaw detector is used, and a connecting wire of a detection probe is scattered and is easy to knot, and comprises an ultrasonic flaw detector body and a connecting plug arranged at the top of the ultrasonic flaw detector body, and a threaded cylinder is fixedly connected to the top of the ultrasonic flaw detector body and positioned on the periphery of the connecting plug; the inner surface of the threaded cylinder is in threaded connection with a winding pipe; according to the utility model, through the arrangement of the winding pipe and the winding column, the connecting wire of the probe is wound on the winding pipe and the winding