The utility model discloses a IGBT moves back saturated detection circuitry, this detection circuitry include voltage comparater, and voltage comparater's first input end is connected with IGBT's collecting electrode, and the second input is connected with the presupposition voltage source. This detection circuitry simple structure can detect out IGBT fast, reliably, effectively and move back saturated phenomenon to help avoiding moving back the damage that the saturation leads to components and parts in the circuit because of IGBT.