With the continuous deepening of the concept of energy saving and emission reduction, heat pumps have been widely applied to life. With the improvement of heat quality, the corresponding condensation temperature of heat pump devices is required to be high. Therefore, high-temperature heat pumps have become a hot topic, looking for A high-temperature heat pump working fluid is an effective way to develop a high-temperature heat pump device. Exploring a new heat pump cycle mechanism is also an effective way to generate a high-temperature heat pump device. This paper combs the research status of a high-temperature heat pump in the field at home and abroad and analyzes the existing high-temperature heat pump working medium and high-temperature heat pump circulation mechanism, mainly expounds the principle of the existing high-temperature heat pump technology.