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In view of the existing constant temperature infusion device on the market or relying on import, or large size, it is not applicable in many small hospitals, and a new type of constant temperature infusion blood transfusion device was designed. Through experimental tests, a series of functions such as heating and heating of liquids including blood have was realized. The main control chip of the device is STM32 microcontroller, the heater is 220V, 68W silicon rubber heating plate, and the temperature detector is DS18B20. The PID algorithm accelerates the response speed of the temperature control system and realizes the constant temperature control function. At the same time, the temperature jitter is effectively suppressed, which makes the device more stable and reliable during operation. In addition, through the human-computer interaction system such as the display screen, speech synthesis module, and infrared remote-control switch, the intelligentization of the device is realized, so that a more humanized service is provided.