Magnetic powder detection method for workpiece with temperature

The invention relates to the technical field of workpiece detection, in particular to a magnetic powder detection method for a workpiece with temperature, which comprises the following steps: firstly, carrying out heat insulation treatment on an electromagnetic yoke, magnetizing a detection object by adopting a rotating magnetic field magnetization method on the electromagnetic yoke subjected to heat insulation treatment, and then preparing a high-temperature-resistant magnetic suspension and an ultrahigh-temperature-resistant magnetic suspension; when the surface and the near surface of a detected object are magnetized, magnetic suspension is applied to the surface of the detected object, the magnetic suspension keeps flowing and drives ferromagnetic powder particles in the magnetic suspension to freely flow on the surface of the detected object, and when the surface or the near surface of the detected object has defects, due to the effect of magnetic resistance at the defects, the ferromagnetic powder parti