An intelligent wearable device and a method for physical sign measurement, comprising a photoelectric sensor, an inflatable ring, an air valve and a control unit. When the valve is in an open state, the inflatable ring can be inflated and deflated alternately. When the air valve is in a closed state, inflation or deflation of the inflatable ring is stopped. The photoelectric sensor is located at an inner side of the inflatable ring for measuring physical signs, with the control unit is connected to both the photoelectric sensor and the air valve for controlling the state of open and close of the air valve according to the physical sign parameters measured by the photoelectric sensor. The device measures physical signs on the basis of automatically controlling the air valve, where the photoelectric sensor contacts the vascular wall, and as a result, improves accuracy the measurements.
