The invention relates to the technical field of electrical elements, in particular to a preparation technology for electrical insulating elements. According to the preparation technology for the electrical insulating elements, fiber materials and epoxy resin matrices are pre-treated so that fiber fabric can be guaranteed to be fully soaked in epoxy resin, the forming process of vacuum infusion andin-situ extrusion curing is adopted so that solid insulated tension pole prefabricated parts without defects such as dry areas and bubbles can be prepared, and therefore insulated tension poles prepared from the solid insulated tension pole prefabricated parts can be excellent in mechanical performance and electrical insulating property and can be safely and stably applied to a high-voltage environment of 750kv or above. The preparation technology has the advantages that the solid insulated tension poles prepared through the preparation technology can have the characteristics of being smallerin size and convenient to carry and operate, in addition, the electrical insulating property and the mechanical performance can be better, the service life can be longer, the risk of internal breakdown can be avoided, and the safety performance can be better; and in addition, the size of the fiber fabric is selected so that the multiple insulated tension pole prefabricated parts can be manufactured at a time, and the production efficiency can be greatly improved.