The invention discloses a measurement method and device. The measurement method comprises the steps that an object to be measured is measured for at least twice, and measurement values are recorded; an extreme value is removed from the measurement values; and final measurement data is obtained on the basis of the residual measurement values. A measurement point to be measured is measured for multiple times continuously, the measurement values except the extreme values approach the real value more, and the final measurement data obtained from the residual measurement values; and thus, measurement errors caused by ambient light and equipment vibration of an optical instrument in the measurement process can be eliminated or reduced, and the measuring accuracy is improved. It is not required to change hardware of present equipment, and the cost is low.