A signal acquisition device is designed to achieve acquisition

processing of pulse wave signal by photoplethysmography（ PPG）. The dual light source diode is used as the sensing and acquisition terminal

and the optical frequency converter is used as the data receiving terminal to acquire the pulse wave signal. MCU STM32 L151 CBT6 completes the control of double light source diode flicker frequency and the realization of the denoising algorithm of the collected original signal. A morphological filter combined with RC digital filter is proposed to remove baseline noise. It is proved that it can get better characteristic wave and improve the signal-tonoise ratio. The data can be transmitted to the terminal display via the Bluetooth module in this device.