Data missing was always when scanning plant organs by using 3D laser scanner, and this could lead to holes appearing in the mesh surface generated from the scanned point cloud. Basing on the analyzing to the geometrical features of different types of plant organs, a hole-filling algorithm was proposed which based on the normal vector of the mesh to make the repair area as close as possible to the original model of the organs mesh. The algorithm firstly extracts the hole boundary in the surface mesh, and compute the positions of new points based on the normal vector and normal curvature of the mesh boundary, then connects the new points and boundary points to generate a new triangular mesh. Experiments on different plant organs of geometric shapes were taken and new triangular mesh qualities were evaluated. Results show that the algorithm can fill holes in several kinds of scanned plant organs mesh quickly and efficiently.