The invention relates to a quick calculation method of a load switch electromagnetic mechanism on the basis of a radial basis function. The method comprises the following steps: firstly, on the basis of an interpolation thought, constructing a function expression which reflects an electromagnetic mechanism output characteristic relationship on each process variable node; secondly, establishing an expression which reflects a design parameter and the electromagnetic mechanism output characteristic relationship, carrying out optimization by taking a RMSE (Root Mean Square Error) and a multiple correlation coefficient R2 as indexes, and determining a radial basis function model; and thirdly, resampling the process variable node, calculating corresponding output characteristics, combining with the determined radial basis function model, taking error function minimization as an optimization target to determine an unknown influence coefficient about the process variable so as to establish the approximate model of the load switch electromagnetic mechanism, and realizing the quick calculation of the load switch electromagnetic mechanism via the approximate model, wherein the unknown influence coefficient is contained in h(ui,aj)|(x1,x2). By use of the method, the problem that a traditional electromagnetic mechanism calculation method can not give consideration to both time accuracy and timeliness is solved, and the method has the characteristics of high calculation accuracy and good robustness.