The invention discloses an iron ore powder assimilation temperature detection method and belongs to the field of detection of ore powder sintering characteristics. The iron ore powder assimilation temperature detection method comprises the following steps: applying a pressure on an iron ore powder sample by a measuring rod in a heating process, and detecting temperature of the iron ore powder sample and sudden change of displacement of the measuring rod in a temperature rising process, wherein the temperature when the displacement of the measuring rod is suddenly changed is namely the assimilation temperature of iron ore powder, and the sample is heated by virtue of a heating unit in the detection process. The detection method disclosed by the invention has the advantages that sudden change of displacement of the iron ore powder in the heating process is detected by virtue of a detection unit, and the temperature when the displacement of the measuring rod is suddenly changed is namely the assimilation temperature of the iron ore powder, so that the assimilation temperature of the iron ore powder is accurately and objectively detected.