The invention belongs to the technical field of a large stroke high precision positioning platform and particularly discloses a two-degree-of-freedom floating movement platform which comprises a marble base, a first X-direction movement assembly, a second X-direction movement assembly and a Y-direction movement assembly; the first X-direction movement assembly and the second X-direction movement assembly are separately arranged at two ends opposite to the marble base; the two ends of the Y-direction movement assembly are separately connected to the first and second X-direction movement assemblies; the first X-direction movement assembly comprises a first X-direction marble guide rail arranged on the marble base, a first X-direction slide block sleeving the first X-direction marble guide rail and a first X-direction horizontal air floating block; and the first X-direction horizontal air floating block is arranged on the first X-direction slide block for adjusting the thickness of an airmembrane between the first X-direction slide block and the first X-direction marble guide rail automatically. The air floating block keeps the thickness of the air membrane invariable, so that the positioning precision is improved.