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A medical infusion monitor and protection system is designed based on technologies of photoelectric monitor, modulation demodulation, single chip microprocessor (SCM), and wireless communication, etc. The infusion signal is collected by infrared photoelectric conversion characteristic. SCM AT89C51 processes monitor data and control area infusion speed and controls wireless transceiver nRF905 to constitute wireless communication system to transmit data. Through the serial interface MAX487 connected main controller with each control node, upper PC can monitor and control each node in real-time and renew control-schemes. Experiments shown that the rate of infusion speed monitor error is less than 2 drop every minute, and stability time is faster, which effectively completes intelligent infusion system monitor and alarm.