To address the quality problems caused by the debonding defects of the solar array substrate during the manufacturing process， the phase-locked infrared thermal imaging detection research was carried out. By designing a reference block that was consistent with the debonding type of the battery array substrate， the influence of the uniformity of the adhesive content and the density of the carbon fiber mesh on the detection image was analyzed， and the real debonding defect feature information and parameters were obtained， so as to realize automatic defect screening. The test results show that phase-locked infrared thermography can effectively detect the debonding defects of the solar cell substrate， effectively improve the product detection efficiency and reduce the work intensity of the inspectors.