The invention discloses a method for constructing pore throat sections of a rock pore network model by considering concavity and convexity in the technical field of image processing. The method comprises main steps of scanning a real rock core based on a CT technology and performing three-dimensional reconstruction; performing pore throat segmentation on the three-dimensional rock core, performing numbering and sorting on all pore throats, and making statistics on pore throat geometric parameter information; obtaining a relationship between a maximum inner angle of a quadrangle and a shape factor by utilizing a numerical experiment; determining the maximum inner angle of the quadrangle according to the concavity and convexity and the shape factor; making a diagonal line from a vertex of the angle, dividing the maximum inner angle into two parts, and determining the length of the diagonal line; establishing a section nonlinear feature equation and calculating the side length of the quadrangle with a Newton iteration method; and checking whether the feature equation has a positive solution and conforms to physical significance or not, and if not, performing reconstruction until all the pore throat sections are constructed. According to the method, the concavity and convexity of the cross section and the equivalency of the hydraulic radius of a porous medium are fully considered, so that the accuracy of representing the real porous medium by the pore network model is improved and a seepage parameter of the porous medium can be accurately predicted.