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A detection method based on scanning laser line source(SLLS) for metal surface defect position was proposed, and the experimental platform was built to analyse the detection efficiency. The sample surface was scaned by SLLS to excite the ultrasonic signal in the sample, which was detect with two-wave mixing interference detection method. The defect position was located according to the position relationship between the excited Rayleigh wave and the defect, the reflected wave and the defect.In the experiment,the defect position was calculated using the line source position and the detection point position as test reference point respectively. The experiment results show that the relative error is 0.23% in the latter case.