The invention relates to a method and model for constructing a data interaction channel of a PLC protocol test. The method comprises the following steps: creating an independent channel management module; creating a plurality of parallel working components in real time in the channel management module; and transmitting data needing to be issued by a test case to a hardware device through the corresponding parallel working components or transmitting the data reported by the hardware device to the test case through the corresponding parallel working components. By adoption of the method providedby the invention, the data can be continuously processed and transmitted, and the data interaction processing demands of a test system are satisfied.