Abstract: The traditional electronic weighing device of the belt conveyor has complex structure, low weighing accuracy and large error. By analyzing the arrangement of the belt conveyor, a kind of symmetrical double roller belt conveyor is designed in this paper. The hardware system module and control circuit are designed; the software system of the belt conveyor weighing device is programmed; the test platform of symmetrical belt conveyor weighing device is built, and tests are then carried out. The results show that the symmetrical and double roll weighing structure offsets the influence of horizontal force, and the weighing detection error is small; in a certain range, the greater the initial tension, the smaller the material uniform distribution load, the smaller the error. The overall structure is simple and stable, the weighing accuracy is high, and the stable and reliable experimental results are obtained.