The invention provides a parametric modeling method for a mesh reflecting surface antenna. The method comprises the following steps that: firstly, selecting an antenna form as a truss type or a radialrib type; then, inputting the antenna parameter, wherein the antenna parameter comprises a network cable segmentation number for the truss type antenna, and the antenna parameter comprises a radial network cable layer number and a surrounding node interval for the radial rib type antenna; determining the boundary nodes of the network cable, and carrying out mesh surface node growth from a bottomedge or generating the mesh surface node according to the initial interval of the surrounding nodes through an equilateral triangle rule; then, generating all triangles which take adjacent mesh surface nodes as vertexes to form an antenna shape surface; calculating the accuracy of the antenna shape surface; and judging whether the accuracy of the antenna shape surface meets preset accuracy requirements or not, if the accuracy of the antenna shape surface meets preset accuracy requirements, extracting the network cable and shape surface information of the antenna, outputting a shape surface design interface file, and otherwise, adopting a dynamic boundary regulation method to update the network cable and the shape surface of the reflecting surface until the shape surface accuracy meets thepreset accuracy requirements. By use of the method, the high-efficiency accurate calculation of the accuracy of the shape surface is realized.