The invention relates to a fixed high-strength glass fiber epoxy wrapping belt used for a thyristor valve string, and the wrapping belt provided by the invention is characterized by being made of a composite material, wherein the composite material consists of an enhanced phase and a base phase, wherein the enhanced phase is alkali-free glass fiber and the base phase is epoxy resin; the product of the technology has higher specific strength and specific rigidity and is connected with the head and tail of the thyristor valve string in a surrounding manner, thus preventing the whole epoxy plate from being used, lightening the volume and weight of the serial thyristor valves and facilitating the installation and maintenance.