The invention discloses a manufacturing method of a railway-used wind sand-resistant umbrella-shaped core rod with insulators; the method comprises the following steps of: step 1, processing the core rod body. Firstly, the whole core rod is processed and manufactured, and then, the core rod with the whole length is cut into multiple core rod bodies according to the length of the insulator needingto be processed; step 2, the umbrella skirt of the core rod is processed at the outside of the core rod body through the following steps: the outer surface of the core rod body is grinded in a conventional manner, washed with a cleaning liquid, put in an oven for prebaking and evenly and externally coated with a layer of coupling agent; the core rod body coated with the coupling agent is put in the middle of a pressure casting die; then, mixed materials which consist of epoxy resin compound glue liquid and glass fiber are filled into pressure casting die and put in a pressure casting and molding device for pressure casting and molding. The manufacturing method has simple processing technique and convenient operation; the umbrella-shaped core rod processed with the manufacturing method hashigh safety and long service life and can effectively solve the problem of electrical default caused after the insulating sheaths of compound insulators are broken.