The micro-magnetic tile image has the characteristics of low contrast ,complex texture background, uneven brightness and small defect area.This paper proposes a method of linear detects on micro-magnetic tile surface.Firstly,an adaptive static mask is constructed to shield the micro-ma gnetic tile profile.Secondly,the nonlinear anisotropic diffusion equation is used to suppress the surface texture of the micro-magnetic tile. Further,the dynamic mask is constructed to scan the magnetic tile image from th e bottom to the top,and the linear defects are extracted.Finally,an experimental device for visual inspect ion of micro-magnetic tiles was developed and a large number of experimental studies were carried out.The exper imental results show that the defect extraction algorithm can accurately extract the linear defects on micro- magnetic tile,and the accuracy of surface defect detection is 94.6%.