The measurement of circular feature on the components is an important aspect of quality control and automation in industrial manufacturing. Aiming at the problem of weak adaptability and weak robustness of measuring spatial circular pose based on computer vision principle, a measurement method based on linear structured light sensor is studied. According to the transformation relation between the ellipse on the image and the two quadric surface equations corresponding to the spatial circle, the normal vector of the circular hole is obtained. Then the circular hole plane is constructed by combining the vector and the three-dimensional coordinate data of the two intersection points of the laser line and the circumference. Experimental verification of the measurement method shows that,when the radius of the circular hole is within the range of 2--4 mm, the average error of the normal vector is 0.3°, the average error of the radius is 0.02 mm, and the average error of the coordinates of the center of the hole is 0.02 mm under the various attitudes of the line structured light sensor and the space circle. In the comparison experiment, the maximum radius error of this method is 0.04 mm for the circular hole whose radius of 3.054 mm, and the maximum error value of the old method is 0.23 mm.It is proved that the method can achieve high precision, wide adaptability and strong robustness in various situations.