The invention discloses a radial-scanning-measurement-based precision reconstruction method for a three-dimensional facial contour. The method comprises: determining a radial scannning line and select a plurality of reference scanning lines; according to the plurality of radial reference scanning lines, acquiring two-dimensional cross-sectional profiles on all radial reference scanning lines; determining height values of all points of all radial reference scanning lines after three-dimensional facial contour reconstruction; determining height values of all points of all radial scanning lines after three-dimensional facial contour reconstruction and reconstructing an overall three-dimensional facial contour; and removing a relative inclination amount and a relative translational amount of the reconstructed three-dimensional facial contour in any two orthogonal directions to complete reconstruction of the three-dimensional facial contour of the measured surface. Therefore, movement errors of a scanning platform among all scanning lines can be eliminated effectively; and the signal to noise ratio during practical measurement can be increased effectively by selecting a plurality of reference scanning lines, impact of noise on the reconstruction accuracy can be suppressed, and thus the accuracy of reconstruction can be improved substantially. The method can be applied to the three-dimensional reconstruction field widely.