The present invention relates to a bowel cleansing preparation comprising, as a first cleansing ingredient, a certain sugar alcohol such as xylitol and sorbitol； as a second cleansing ingredient, ascorbic acid or a mixture of ascorbic acid and a salt of ascorbic acid； and aqueous solvent, wherein the concentration of said first cleansing ingredient is 10 g/L to 500 g/L based on the total preparation, the concentration of said second cleansing ingredient is 15 g/L to 500 g/L based on the total preparation, and the volume of said aqueous solvent is 0.1 L to 1.0 L. The bowel cleansing preparation has excellent cleansing efficacy, improved ease of administration and safety and can thus be used for bowel preparation prior to colonoscopy, therapeutic endoscopy, abdominal surgery and anal surgery for hemorrhoid as well as for the treatment and alleviation of diseases such as chronic and acute constipation.
