The invention discloses a manufacturing method of an insulating cylinder and a pipe fitting made from a fiber composite material. The manufacturing method is characterized by comprising the following process steps: impregnating fibers; setting winding tension of a fiber bundle; winding the fiber bundle; heating and curing; and photocuring the outer surface and the like. According to the fiber composite material manufactured by adopting the method disclosed by the invention, the manufacturing cost is lowered by over 30% compared with that in the prior art, and the electric property and the mechanical property of the material are superior to those of a fiber composite material which is manufactured by adopting the prior art.