The invention relates to the technical field of glass fiber fabrics, in particular to a shape-finalized polyimide fabric and a manufacturing method thereof. The manufacturing method includes the following steps that fiber drawing is performed, gum dipping and fabric weaving is performed, and glass fiber is immersed in a polyamide acid glue solution to perform sizing treatment, is taken out and dried and then is woven into a glass fiber fabric blank; baking and curing are performed to enable the polyamide acid glue solution to be completely aminated so as to obtain the shape-finalized polyimide fabric, wherein the polyimide resin weight content in the shape-finalized fabric is no more than 30%. According to the manufacturing method, the polyamide acid glue solution is adopted to directly conduct shape finalizing on the glass fiber, weft skewing and other problems of the glass fiber during weaving can be prevented, and the weft skewing problem of traditional glass fiber fabrics in the dipping, sizing treatment and pressing process is also avoided. In addition, the shape-finalized polyimide fabric is applied to PCB, has better ageing resistance, heat resistance, corrosion resistance, ion migration resistance and the like and can meet the requirements of the industry of modern microelectronics.