In order to solve the deformation problem of metal additive manufacturing parts, the deformation detection technology based on double profil meter is studied. With laser triangulation method as the core measurement method, the 3D reconstruction of workpiece surface topography is completed by point cloud data splicing processing. The experimental results show that the measurement resolution of the system is 2 μm, which can provide a new detection method for the deformation detection technology of metal additive manufacturing process.