Abstract: In view of the lack of portable medical equipment in modern battlefield armored ambulances, a wrist-type physical parameter monitoring device was designed for armored ambulances. In the device, a reflective principle based MAX30102 biosensor was used to acquire the photoplethysmogra-phy (PPG). The low-pass filter and least squares polynomial were used to remove the high-frequency noise and baseline drift in the PPG signal. The signal processing was completed and the blood oxygen saturation, pulse rate signs parameters were calculated by the STM32 microcontroller. Physical parameters was arranged to not only display in real time on the OLED screen, but also to be written near field communication (NFC) tags, and transmitted to the terminal through the near field communication reader for medical personnel reference. According to the test result, the blood oxygenation error of device can attain ±3%, the pulse rate error attain ±5 times/minute, and the near field communication success rate attain 97%.