The invention provides polyethylene glycol-electrolyte oral solution, which comprises 59 to 60 grams of polyethylene glycol, 1.0 to 1.5 grams of sodium chloride, 0.5 to 1.0 gram of potassium chloride, 1.5 to 2.0 grams of sodium bicarbonate, 5.5 to 6.0 grams of sodium sulfate, 0.02 to 0.5 gram of edentate, 0.02 to0.5 gram of sweetener, 1 to 2 milliliters of flavoring essence and the balance of deionized water, wherein the solution is 1,000 milliliters. The polyethylene glycol-electrolyte oral solution is used in bowel cleansing and has the characteristics of quick response, safety, reliabilityand good cleansing effect. The oral solution is mainly suitable for cleansing bowels before colonoscopy, barium enema X-ray examination and gastrointestinal operation. The small-dose (about one eighth of a bowel cleansing dose) products of the oral solution can be used for treating chronic constipation.