The invention provides a manufacturing method of a middle-sized thin-wall copper Tibetan Buddhist statue. The manufacturing process comprises the steps of design of a Tibetan Buddhist statue artistic drawing, wood carving of a three-dimensional Buddhist statue, manufacturing of silica gel models of all sections of the Buddhist statue, manufacturing of paraffin and gypsum cast molds of all parts, dewaxing and drying of the paraffin and gypsum cast molds, smelting of copper alloy, casting molding of castings of all components, welding assembly of all the components, later-stage finishing of the Buddhist statue and obtaining of the finished Buddhist statue. The manufacturing method of the middle-sized thin-wall copper Tibetan Buddhist statue has the advantages that the Tibetan Buddhist statue is manufactured through welding assembly after split type casting so that the basic wall thickness of the middle-sized Buddhist statue can be smaller than 5 mm, the weight of the Buddhist statue can be reduced accordingly, and the production cost is reduced.