The utility model relates to a special device for nondestructive test on the high temperature fastening bolt of steam turbine of thermal power plane, belonging to nondestructive test technical field. The special device is characterized in that the front end of the device is provided with a probe; a spring is fixed outside the probe; a wafer capable of transmitting and receiving ultrasonic waves is provided in the probe; the wafer is inclined; the tail of the probe is provided with a hollow connecting rod; and wires are arranged in the connecting rod and are connected with the wafer. The utility model can detect high temperature fastening bolt with heating holes via transversal wave at inner hole, can detect the whole length of a bolt with detaching the bolt and reserving the cap of the bolt, and can realize the detection after thermal fastening or online stop, thereby confirming the safe operation of units, on-timely detecting the faults generated after the reassembly of unit, and improving the ultrasonic detection level of bolts.