The invention provides an S-parameter obtaining method based on an embedded multi-port network matching circuit, the method comprising a first step of using a vector network analyzer to measure an S-parameter of a network under test; a second step of setting a parameter of the matching circuit, or using the vector network analyzer to read an S-parameter file of the matching circuit to obtain an S-parameter in the matching circuit; and a third step of using the calculation of the multi-port S-parameter to embed the matching circuit into the network under test, so as to obtain an S-parameter of the entire network. By setting the parameters of the matching circuit, the method provided by the invention effectively simplifies the testing process in matching circuit design, obtains the embedded network parameter in real time without repeating the matching circuit design, and ensures consistency of the matching circuit in the case of a large-scale test to a great extent by reading the parameter file of the matching circuit.