Test sieves are usually used to particle size analysis. Since limit of test facility, complex testing and low accuracy are problems regularly in calibration of test sieves. A automatic calibration method for test sieves using video measuring machine is discussed in this paper in order to increase calibration precision. Firstly, some key technologies are introduced, such as edge detection, mesh edge line fitting, mesh width calculation. Secondly, a sieves calibraion software , which is developed on video measuring machine to prove effectiveness of methods. Thirdly, through comparing with traditional methods, the advantage of video measuring machine on test sieves calibration is discussed, and it maybe get the result of full inspection on every mesh of test sieves.