The invention discloses a porcelain composite disk type suspension insulator. The porcelain composite disk type suspension insulator comprises a porcelain core, an upper accessory and a lower accessory; a silicon rubber umbrella skirt is arranged on the exterior of the porcelain core; the upper accessory and the lower accessory are mounted on the upper end part and the lower end part of the porcelain core respectively; and the contact surface between the porcelain core and the silicon rubber umbrella skirt adopts a spiral type structure. The porcelain composite disk type suspension insulator is HC1 in lyophobic level and has excellent and reliable electrical and mechanical performance, can overcome and solve the shortcomings and problems of the conventional suspension insulator product used for the electric power system, as well as can promote progress of the resource saving type and environment friendly society; the umbrella skirt and a sheath are bright and clean in surface, and freeof bubbles, cracks, glue deficiency and glue overflowing; the surface bump is less than or equal to 0.8mm, and the concave part is less than or equal to 0.8mm; the area of a single defect part is notlarger than 25mm<2>; and the total defect area is not larger than 0.2% of the area of the insulator.