Device and method for monitoring crack propagation life of turbine rotor

The invention provides a device and a method for monitoring internal crack propagation life of a turbine rotor. The method includes the specific steps of: flaw detection and determination of crack size of the turbine rotor; computation of maximum main stress of parts where the crack is; computation of a critical crack size of the turbine rotor; computation of crack propagation life of the turbine rotor; computation of accumulation loss of the crack propagation life of the rotor in an overspeed test process device; computation of the accumulation loss of the internal crack propagation life of the turbine rotor; computation of the internal crack propagation residue life of the turbine rotor; controlling the crack propagation residue life of the turbine rotor; and printing an output result. The device and the method have the advantages that: the residual crack propagation life of the turbine rotor can be calculated on line and monitored regularly; if the residual crack propagation life of the turbine rotor is relatively short, the residual crack propagation life of the turbine rotor is rationally used by immediately overhauling (A-level overhaul); therefore, a technical scheme that the residual crack propagation life of the turbine rotor is monitored regularly is achieved.