Rod type porcelain insulator used in subway tunnel

The invention provides a rod type porcelain insulator used in a subway tunnel. The rod type porcelain insulator comprises an upper accessory, a porcelain piece and a lower accessory. One end of each of the upper accessory and the lower accessory is a round groove structure. The other end of the upper accessory is provided with a fixed hole, and the lower end of the fixed hole is provided with an oblique reinforcing rib. The other end of the lower accessory is a U groove structure, and the side wall of the U groove is provided with a through hole which passes through the U groove. The porcelain piece is a solid porcelain piece with an umbrella skirt structure, and the included angel between umbrella skirts and the porcelain piece is 75 degrees to 85 degrees. Two ends of the porcelain piece are fixed in the round grooves of the upper accessory and the lower accessory through cement adhesive, the contact end face between the porcelain piece and the upper accessory and the contact end face between the porcelain piece and the lower accessory are provided with pads. Compared with the prior art, the material strength and utilization rate are high, an advanced umbrella skirt anti-pollution design is employed by the overall structure, and the fact that the insulator is suitable for different pollution areas is ensured.