The traditional wireless monitoring system based on Zig Bee has many problems, such as limited data transmission distance and high power consumption. A low-power medical monitoring system based on Lora technology is designed. According to the different functions, the whole monitoring system can be divided into three parts, each part realizes data interaction through Lora wireless network. The core device of the detection end is the infrared photoelectric sensor, which sends the acquired dropping speed and liquid medicine margin to the hand-held end through Lora wireless network on the one hand, and to the patient through voice broadcast and LCD display on the other hand, and the detection end is also responsible for receiving the patient information sent from the hand-held end and the rear end. The backstage end is responsible for monitoring patients and nurses in an all-round way. The experimental results show that the medical drip monitoring system designed in this paper has strong anti-interference ability, can realize data long-distance transmission, not only low power consumption, but also easy to network, and has a wide range of application prospects.