The invention relates to a single-phase fluid network modeling method. The method comprises the following steps: according to single-phase fluid characteristics, establishing a branch model of a single-phase fluid network; according to a mass conservation law of a single-phase fluid network node, establishing a node model of the single-phase fluid network; according to the branch model of the single-phase fluid network, establishing a node pressure equation of the single-phase fluid network; solving the node pressure equation by adopting an improved Gaussian elimination method and a Gauss-Seidel iteration mixed algorithm, and calculating the pressure of the single-phase fluid network node; according to the branch model and the pressure of the single-phase fluid network node, calculating the flow of each branch; and according to the pressure of the single-phase fluid network node and the flow of each branch, establishing a mathematic model of the single-phase fluid network. The mathematic model of the single-phase fluid network, obtained with the single-phase fluid modeling method, can reflect a practical operational condition of the single-phase fluid network accurately in real time.