The invention discloses a method for building a prestressed steel cable model in an all-parameterized manner. Forward modelling is carried out on the basis that parameters are stipulated. The method comprises the following main steps of: firstly, creating a prestressed steel cable plane-bending curve according to plane-bending parameters; secondly, creating a prestressed steel cable vertical-bending curve according to vertical-bending parameters; and thirdly, generating a prestressed steel cable spatial axis according to the plane-bending and vertical-bending curves, sweeping along the axis and generating entities, so that an all-parameterized prestressed steel cable three-dimensional model is constructed. By adopting the parameter stipulating and modelling methods, an all-parameterized bridge prestressed steel cable three-dimensional model can be accurately built, meaning of input parameters is definite in a construction process, the three-dimensional model is accurate and reliable, and rapid response to design change can be realized.