One-time matching technology is usually used in laser scanning modeling. However, when outdoor 3D landscape is in 3D environment, one-time matching will lead to the loss of a large number of laser point cloud data features, resulting in poor 3D modeling effect of outdoor landscape. A three-dimensional laser modeling method of outdoor landscape based on secondary matching technology is proposed. Firstly, SFM method is introduced into 3D laser scanning technology to obtain complete point cloud data. Control points are selected for initial registration, and two kinds of point cloud data are accurately registered by ICP algorithm. In order to improve the fusion of point cloud data, secondary matching is carried out for data color and other characteristics, and point cloud data fusion is realized. Finally, all the point cloud data are in the same coordinate, the fused point cloud data is preprocessed by denoising, filtering and point cloud splicing, and the two kinds of surfaces in the data are fitted and imported into 3D software to realize outdoor landscape modeling. Experimental results show that the three-dimensional landscape modeling with the proposed method has high stereo level, clear modeling effect and high precision.