Micro structure with arrayed slots has excellent performances, including friction, lubrication and diffraction, because of their arrayed features. Numerous fields are concentrating on this structure, attributed to its excellent properties. In this paper, the conventional micro end milling tool was analyzed, and the drawbacks in micro slot milling were discussed. A micro slotting tool with a novel structure was proposed, especially focused on fabricating micro arrayed slots with high efficiency. Large tool shank was utilized to avoid weak stiffness resulting from small shank of traditional micro tool, two-line ultra-hard blades with symmetrical distribution were designed to ensure simultaneous milling of multi-slots. Additionally, tool material selections and manufacturing scheme of the tool were suggested.