The invention relates to a preparation method of a metal coated fabric and belongs to the technical field of weaving. The method comprises the steps of taking a fabric as a base material, pretreatingthe fabric with a sodium hydroxide solution, washing with deionized water to be neutral, performing drying, sequentially soaking in a cyanuric chloride solution and a dopamine solution for modification treatment, taking out the fabric for washing and drying to form a modified fabric, performing activating treatment on the modified fabric, and soaking in a chemical plating solution to form the metal coated fabric. The preparation method is simple, short in production cycle and suitable for large-scale industrial production, and conditions are easy to control. The metal coated fabric prepared bythe method has the advantages of excellent electroconductive effect, bendability, good flexibility, excellent adhesion, good frictional resistance and the like. The method can be widely applied to the fields of clothing, spaceflight and the like.