Molten iron temperature is an important index to analyze the quality of molten iron, judge the furnace temperature state, and evaluate the energy consumption level of blast furnaces. The molten iron temperature measurement is a mandatory demand of the iron and steel industry. According to the working principle, the existing measurement technology of molten iron temperature is classified and analyzed. Combining with the environmental characteristics of blast furnace casting field and molten iron, the advantages and disadvantages of the existing temperature measurement technology are discussed from the aspects of temperature measuring principle, measuring position, and technical characteristics. To realize the real-time online and accurate measurement of molten iron temperature in blast furnaces, the research progress and application potential of the infrared visual temperature measurement method are introduced. Based on summarizing the existing measurement techniques of molten iron temperature, the main problems and future research directions of infrared visual temperature measurement are analyzed. The objective is to provide some references for researchers in academia and industry on temperature measurement of molten iron.