The invention discloses an automatic efficiency selection method for increasing a charted depth, and the method comprises the following steps: reading an existing charted depth point outside a water depth to-be-selected region, and building an initial Delaunay water depth triangulation network through a point-by-point interpolation method; finding out all triangles with water depth hollow points, calculating the area of the triangles, and building a hollow triangle link list according to a sequence of area from the big to the small; dynamically updating the hollow triangle link list, and repeatedly carrying out the step till the hollow triangle link list is empty; finding out all triangles with side lengths exceeding a required length, and building a link list of triangles with the side lengths exceeding the required length; dynamically updating the link list of triangles with the side lengths exceeding the required length, and repeating the step till the link list is empty; and finally outputting a selected to-be-selected point plane coordinates and depth. The method sequentially builds the triangle link lists and carries out dynamic updating through the calculation of the area of each triangle in the triangulation network, optimizes the processing sequence of triangles with the hollow points and side lengths exceeding the requirements, and can remarkably improve the efficiency of automatic selection of charted depth.