The invention discloses a turbine blade with a customized flying-off fracture position and flying-off fracture rotating speed. The turbine blade comprises a blade body, an edge plate, a root extendingsegment and a tenon which are connected in sequence; concave portions are arranged on the surfaces of the two sides of the root extending segment, the concave portions formed on the surfaces of the two sides are the same in shape and are symmetrically arranged, and the two concave portions form a stress concentration area for flying-off fracture on the root extending segment. According to the turbine blade, the flying-off fracture position is customized on the root extending segment, the rotating speed of flying-off fracture is lower than the rotating speed of wheel disc rupture, so that theturbine blade is flown off and fractured before a wheel disc, the wheel disc rupture is avoided, and the occurrence of an uncontained accident is prevented. Meanwhile, the invention further disclosesa customizing method of the turbine blade, people only need to carry out cut off material treatment on the root extending segment, and thus the method is simple, low in cost and easy to carry out.