The invention discloses a manufacturing technology of a test block for the comparison of micro cracks in the thermal barrier coating of an engine blade. According to the technology, a pressure is applied on a thermal barrier coating on the basis of a Vicker's hardness meter; the stress of the diamond quadrangular pressure head of the Vicker's hardness meter is converged so as to form micro cracks around the edge of the pressure head; the technology is used to produce comparison test blocks for nondestructive test calibration, a Vicker's hardness meter is used, multiple flat test sheets, whose surface is larger than 10*10 mm, are used; different loads are loaded, finally electron microscopy detection is performed, scanning electron microscope observation and measurement are carried out, and drawing instruction is performed. The technology has the advantages that micro cracks can be formed in thermal barrier coating with a thickness of 22-120 [mu]m; compared with other crack manufacturing method, the provided technology is simple and reliable, and moreover, the brittleness of thermal barrier coating can also be evaluated.