A water-soluble cleaning agent sheet includes the following components in parts by weight: 12-35 parts of film-forming agent, 0-3 parts of thickening agent, 0-10 parts of water softener, 15-50 parts of anionic surfactant, 1-10 parts of non-ionic surfactant, 1-10 parts of amphiprotic surfactant, 0-10 parts of solubilizer, 1-10 parts of acrylate polymer; 0-10 parts of plant extract, and 0-1 parts of preservative.