Dietary fibre components, hydration properties and antioxidant activities such as 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging, reducing power, metal chelating and 2,2′-azino-bis,3-ethyl-benzo-thiazoline-6-sulphonic acid (ABTS) radical scavenging activities of persimmon peel powders using different washing treatments (tap water at 20 °C and hot water) were investigated. Peel powder obtained from hot water-washed peels (74.95 g per 100 g) had higher dietary fibre content than tap water-washed (65.50 g per 100 g) and unwashed (60.99 g per 100 g) peels. The higher content of total phenolic and ascorbic acid were found in peel powder obtained from unwashed peels, whereas washed peels had more β-carotene content. The EC50 values of scavenging DPPH and ABTS radical for peel powders obtained from unwashed, tap water-washed and hot water-washed peels were 75.44, 142.18 and 110.17 μg mL−1 respectively and 5.31, 5.34 and 5.39 μg mL−1 respectively. Therefore, hot water washing is recommended to obtain better quality products from persimmon peel for use as a fibre supplement.