The present invention relates to a protective structure of a stator and a fan using the same. The protective structure of a stator comprises plural silicon steel sheets, at least one first filler, and a cover body. The silicon steel sheets are surrounded by plural coils. Each of the silicon steel sheets has a hole and plural magnetic poles extending symmetrically outward from the hole. Each of two adjacent magnetic poles defines a space. The first filler is disposed in the spaces. The cover body is disposed to surround the silicon steel sheets such that the cover body, the silicon steel sheets, and the first filler are integrally combined. Therefore, by means of the first filler disposed in the spaces of each of two adjacent magnetic poles, the amount of cover body material can be effectively reduced to further achieve the effect of cost reduction.