Provided in the present invention is a method for constructing a constitutive parameter of a metamaterial for preparing a waveform beam splitting module. The waveform beam splitting module is used for dividing an input wave source into any number of paths of wave beams. The method comprises the following steps: according to a beam splitting requirement of a waveform beam splitting module, in conjunction with a transformation relationship between coordinate points in a virtual space OA'B' (x, y, z) and coordinate points in a physical space OAB (x', y', z'), using a Jacobian matrix A to obtain a transformation relationship coefficient; and substituting the transformation relationship coefficient into a first formula, and substituting an obtained result into a second formula to obtain a constitutive parameter of a metamaterial for preparing the waveform beam splitting module. Based on the constitutive parameter of a metamaterial for preparing a waveform beam splitting module, the metamaterial for preparing the waveform beam splitting module can be determined, and the beam splitting module prepared based on the metamaterial can divide an input signal wave source into any number of paths of input wave sources.