The invention relates to an electric blood pressure meter, which comprises automatic aerator, pressure device, measurer, controller and display. Wherein, it uses aerator to aerate the pressure device, uses sensor to sense the pressure of air bubble to obtain the pressure valve, and display the valve on analogue mercury ruler; the ruler is divided into several sections, based on pressure values to display the section at said pressure value, and indicate relative ruler scale. Therefore, the electric blood pressure meter can avoid display whole mercury ruler, but display segmented, to reduce the cost and avoid hand-operated aerating, to simplify the operation, and uses the automatic discharge valve to uniformly discharge air to improve the accuracy. |