The invention discloses a blanking layout optimization method for a blanking process in punch forming, which comprises the following steps: 1) a mathematical model is established according to a blanking part and a layout form, a layout optimization target function and an optimization parameter solution domain are determined, and a target function value is taken as the mass distribution in the solution domain to establish a corresponding gravity field; 2) a plurality of points are randomly selected in the solution domain, and coordinates of the points are layout parameters; 3) the initial speed and the acceleration of the selected points are preset as 0; 4) the time interval dt of the evolutionary computation is set according to the solution domain and the target function; 5) the total gravitation of the selected points is computed; 6) according to the received gravitation, the acceleration, the speed, the displacement and the position of a new coordinate of each selected point are computed; 7) a target function value of each selected point and the coordinate position of a maximum point of the target function value after the coordinate position is updated; 8) whether a maximum value of the target function and a coordinate of the point are maintained within the computational accuracy range in continuous time intervals is judged, and an optimum layout scheme and an optimum layout parameter are obtained if the maximum value of the target function and the coordinate of the point are maintained within the computational accuracy range in continuous time intervals; and 9) if not, the operation returns to the step 5 to continue the next evolutionary computation process until the optimum solution is obtained. The method adopts an evolutionary algorithm of simulating the gravitational contraction to realize the optimization of a blanking layout scheme according to four different layout forms, namely ordinary single layout, ordinary double layout, single opposite layout.