Abstract: A combination type support rack structure includes multiple upright support posts, multiple separation boards mounted between the support posts, and multiple support and securing devices mounted on the support posts for supporting and securing the separation boards. Each face of each of the support posts is formed with at least one insertion groove. Each of the support and securing devices includes an insertion block received in the insertion groove, an ear seat protruded outward from one side of the insertion block, and a plate block pivotally mounted on the ear seat in an eccentric manner. Thus, the combination type support rack structure may be assembled easily and quickly, without having to use screws or tools, thereby saving time and manual work.