Maokou limestone is taken from the tunnel in Chongqing BeiBei Station, and according to the rock cover thickness and Maokou limestone bulk density, uniaxial compression creep test of Maokou limestone sample is conducted by MTS815 multi-function rock testing machine under 6 MPa for 24 h, and the strain-time curve is obtained. The strain-time curve is analyzed, and it is found that the limestone has the rheological characteristics of elastic-elasticoviscosity, which is similar to Poyting-Thomson model. The rheological experimental data is fitted through Poyting-Thomson model equation by Origin software, and the rheological fitting curve under low stress level is obtained, which better reflects the test data. It is concluded that Poyting-Thomson model can reflect the rheological properties of Maokou limestone. Finally the parameters of rheological models of Maokou limestone under low stress level are found out.