The invention discloses a test model for simulating wind-deviation inter-phase flashover of single-conductor power transmission lines and a method for applying the test model. The test model comprises a first aluminum stranded wire (1) and a second aluminum stranded wire (2). The first aluminum stranded wire is supported by at least four insulating support columns, and the second aluminum stranded wire is supported by at least four insulating support columns; grounding wires (11) are connected with two ends of the first aluminum stranded wire, and a power-frequency test voltage transformation system is connected with the second aluminum stranded wire. The test model and the method have the advantages that conditions that gap distances of a certain portion of two phases of conductors are reduced to a great extent while safety gap distances among other portions are still kept after the conductors are deviated by wind can be effectively simulated by the test model; insulator strings can be repositioned, so that the minimum inter-line gap distances can be changed by the test model, and flashover characteristics of the two phases of conductors at different gap distances in span under wind-deviation conditions can be simulated.