The invention discloses an improved focusing three-dimensional morphology measurement method. The method comprises the following steps of using a low coherent white light interference measurement system, and carrying out continuous acquisition so as to acquire a plurality of interference images with a high contrast ratio of a measured object possessing a smooth surface; calculating a maximum value of a focusing factor of each pixel coordinate point in each image; and according to the maximum values of the focusing factors of all the pixel coordinate points, determining accurate focusing positions of all the pixel coordinate points so as to recover a three-dimensional morphology of the measured object possessing the smooth surface. In the invention, through using the low coherent white light interference measurement system, continuous acquisition is performed so as to acquire the plurality of interference images with the high contrast ratio of the measured object possessing the smooth surface; and according to the maximum values of the focusing factors of all the pixel coordinate points, the accurate focusing positions of all the pixel coordinate points are determined so as to recover the three-dimensional morphology of the measured smooth surface object. The method possesses advantages that an automation degree is high; measurement operation is simple; measurement precision is high; and the method is easy to popularize and promote and so on.