The present invention belongs to the field of vacuum metallurgical casting technology. In the concrete, it relates to a vacuu electromagnetic centrifugal casting process for producing cast pipe. Said invention adopts CaO crucible to make melting, and its process includes the following steps: charging material, evacuating, melting alloy and refining, alloy condensation, heating-up and adding material, starting electromagnetic device and horizontal centrifugal device, regulating temperature and pouring the molten alloy into casting pipe mold. Said method can accurately control alloy components, and can make impurity content in the alloy be less than 200 ppm.