With regard to the electronic scale′s problems such as the material of the electronic scale cantilever beam, weighing method and unitary function, this article proposes a design of the steel cantilever beam type electronic scale which uses MCU as a controller, electric resistance strain gauge pasted on the steel cantilever beam as weighing sensors, combines matrix keyboard circuit, LCD display circuit, A/D conversion circuit and voice broadcast circuit, etc. Such electronic scale has the function of measuring the weight between 5.00 g to 500 g. When the weight is below 50 g, the weighting error will be less than 0.5 g; when the weight is above 50 g, the weighting error will be less than 1 g; Such electronic scale has the function of unit price setting, amount accumulating according to the weight; the machine also has the net weight function (i.e. deducting the packing′s weight) and the voice broadcast function. The whole system adopts the storage battery as its storage battery which improves the portability and the reusability of the system. The experiment verifies that this system has the advantages of high measure precision, clear display, stable performance, etc., could be used in diversified situations. This design, therefore, has a certain guiding significance to the improvement of the cantilever beam type electronic scale.