The invention discloses a preparation method of integrated silicone rubber composite cloth, wherein the preparation method includes the steps: S1, providing an intermediate fabric; S2, impregnating the intermediate fabric in a silicone rubber original solution; S3, metering the impregnation amount of the silicone rubber original solution in the intermediate fabric treated in the step S2, and removing excess silicone rubber original solution according to the predetermined metering standard; S4, laminating each of the upper surface and the lower surface of the intermediate fabric treated in thestep S3 with a surface fabric, to form a fabric composite layer structure; and S5, carrying out hot compression deaeration hardening treatment on the fabric composite layer structure, to form the integrated silicone rubber composite cloth. According to the method, integrated combination between the fabric and the silicone rubber layer can be realized, the problem of environmental pollution causedby use of organic binders in conventional silicone rubber composite cloth production can be effectively avoided, the production cost of raw materials is reduced, the binding force between the composite layers is enhanced, the tensile strength and the delamination resistance strength of the silicone rubber composite fabric are improved, and the industrial application scope of the silicone rubber composite cloth is further expanded.