The present invention provides a crack evolution test method of a floor strata solid-fluid coupling material, wherein the problem that the similar solid-fluid coupling simulation can not be really achieved is solved with the present invention. The crack evolution test method comprises: 1, weighing sand, paraffin, hydraulic oil, asphalt, calcium carbonate and vaseline according to a certain ratio; 2, carrying out heating melting on the paraffin, the hydraulic oil, the asphalt and the vaseline, and uniformly stirring; 3, adding the sand and the calcium carbonate, and co-stirring; 4, carrying out tamping molding and demolding standing on the materials; 5, carrying out a mechanical property test and recording character features; 6, selecting the proximate ratio of the suitable materials; 7, repeatedly performing the steps 1-3 to complete the simulation floor; 8, placing the simulation floor in a floor rupture simulation test device; and 9, applying a water pressure, and observing and recording the damage law and the crack evolution features of the simulation floor. According to the present invention, with the developed material, the physical and mechanical properties of the similar material of the model test can be well maintained, the two conditions such as solid deformation and similar permeability can be met, and the good effect can be achieved in the crack evolution test.