Titanium clad steel plate has been widely used because of the excellent corrosion resistance of Ti and the low cost of constituent material, but the quality of the bonding surface directly affects its overall strength. Therefore, an effective nondestructive testing method is needed to detect the debonding. The use of non-contact ultrasonic techniques can have distinct advantages over conventional contact methods, allowing more rapid and practical scanning without suffering from variations introduced by an acoustic couplant. In this paper, a laser-electromagnetic ultrasonic detection method for debonding defects is proposed to evaluate the bonding performance. A linear light spot with a length of 10 mm and a width of 0.2 mm irradiates the material to produce spattering material. Longitudinal waves are generated in a sample by means of the splash recoil, and they are obscured by debonding defects. Thus, the amplitude of the signal received by the electromagnetic ultrasonic transducer (EMAT) with center frequency of 1 MHz at the opposite side is attenuated, and the amplitude decreases with the increase of occlusion length. Especially, when the amplitude attenuation is half of the reference value, the defect boundary is on the line between the spot center and the transducer center. According to the change law of signal amplitude, the defect boundaries and its area can be determined. Theoretical analysis and debonding measurement experiments show that the non-contact laser electromagnetic ultrasonic method can be used as an effective detection technology for debonding defects of titanium clad steel plate.