The present invention provides a rush juice powder which is mainly made from rush containing a high percentage of dietary fiber and having an antibacterial function and an anti-inflammatory function, has an extremely high function to eliminate active oxygen through interaction with a matcha (powdered green tea) in addition to the original functions of rush, and further is easy to drink. A rush juice powder contains a powdered rush which is made by soaking a rush in hot water for a blanching treatment, drying the blanched rush by hot-air and then pulverizing the dried rush. Both a matcha (powdered green tea) and a cyclic oligosaccharide are blended at a respectively determined ratio to the powdered rush.本發明課題在於提供一種藺草青汁粉末,其以食物纖維含量高且具有抗菌機能、消炎機能之藺草為主原料,除了藺草本來之機能,因抹茶粉末之相互作用而發揮極高之活性氧消除機能,且飲用方便。;本發明之解決手段在於將藺草浸漬於熱水進行殺菁處理後熱風乾燥並粉碎成粉末狀,其中,相對於藺草粉末分別以既定之比例混合有抹茶粉末與環狀寡糖。