The utility model belongs to the nondestructive test field provides a test block of welding seam eddy current inspection very much. This test block of welding seam eddy current inspection includes: try the block base body 11, try the block base body 22, welding seam 3 and a plurality of crackle structure, the examination block base body 11 and 22 butt weldings of the examination block base body, welding seam 3 is located the examination block base body 11 and tries the block base body between 22. The utility model has the advantages of: the size of being examined a true crackle can be simulated effectively in the invention, test block of welding seam eddy current inspection that eddy current inspection used is unanimous basically with material, shape, thermal treatment state and the surface state examined, has the artificial defect who accords with inspection standard on it, can effectively be used for the size of setting for inspection sensitivity and assesing the defect.