A composite suspension insulator comprises a flange and an umbrella-type skirt edge. The flange is provided with a line pressing seat. The line pressing seat is provided with a line pressing groove. The line pressing seat is fixed together through a bolt. The flange is arranged on an insulating rod. The insulating rod is provided with the umbrella-type skirt edge. A bottom of the insulating rod is provided with a metal plate. The metal plate is provided with wiring holes. The line pressing seat is formed by an upper clamping plate and a lower clamping plate. The umbrella-type skirt edge is made of rubber. A surface of the insulator is coated with a layer of anti-pollution flashover paint. There are four wiring holes. The insulating rod is provided with the umbrella-type skirt edge and the surface of the insulator is coated with a layer of anti-pollution flashover paint so that hydrophobic migration performance is increased, an insulation level is enhanced and generation of pollution flashover can be effectively prevented. Because of the anti-pollution flashover paint arranged on the surface, a pollution flashover problem caused by atmosphere pollution can be effectively prevented. Corrosion resistance performance and aging resistance performance are possessed. And an insulating property is good.