This paper designs and implements a high-precision digital display mass analyzer based on a microcontroller. The system uses an STM32 series microcontroller as the core control unit and employs a high-precision resistive strain gauge pressure sensor as the signal acquisition front end. It is paired with an HX711 dedicated analog-to-digital conversion chip to convert the weight signal into a digital value. The system software, through digital filtering and calibration algorithms, effectively eliminates zero drift and non-linear errors, achieving precise measurement of object mass. In addition, the system integrates functions such as LCD display, numerical calculation, and keyboard calibration. It features a simple structure, low cost, high measurement accuracy, and good stability. Experimental test results show that the system meets the high-precision weighing requirements of daily commercial and laboratory environments, demonstrating certain practical value and potential for wider application.