A three-line structured light three-dimensional (3D) scanning method is proposed in order to achieve the purpose of measuring human faces in high resolution rapidly. Three parallel structured light strips with the same distance are projected on the human face to obtain scanning image sequences. In accordance with the location relationship of light strips between adjacent images, three light strips are grouped. Combining with the calibration result, point cloud of the human face is gained. Then, the original point cloud is fitted and resampled to obtain uniform data. Experimental results show that this method is a rapid and efficient 3D measuring method.