The invention relates to a process method for producing composite industrial base fabric. Polyester colored pre-polyester yarn is taken as a raw material and a production process method comprising the steps of texturing the polyester colored pre-polyester yarn; weaving; managing grey fabric; washing at normal temperature; dehydrating; scutching and slitting; and tentering and setting is adopted to produce the composite industrial base fabric; and the process method leaves out a high-temperature dyeing link, so that the whole production process is completed by only 10 hours, and the production efficiency is improved greatly; and the production process has no environmental pollution, water resources are saved, and products are compact in structure, good in handfeel and stable in quality.