The invention relates to an electric blood pressure meter, which comprises automatic aerator, pressure device, measurer, controller, first and second displays. wherein, the aerator can aerates the pressure device; the sensor senses the pressure signal of air bubble to obtain pressure value, to display said value on the analogue mercury ruler of first display; said ruler is divided into several segments, to display the section at said pressure value at least, and indicate the analogue mercury post to relative ruler scale, to be detected by doctor to obtain blood pressure value; and the invention can use oscillography to automatically calculate out the measure result to display it on second display as numbers; 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. |