NOVELTY - Interplanting prickly pear and wild sweet potato on saline soil involves taking phosphogypsum, milling, adjusting saline-alkali soil moisture content, mixing phosphogypsum powder, fertilizer oil cake and microbiological mushroom residue into saline soil, rotary processing, covering, and leaching; preparing site by applying rot fertilizer uniformly into treated saline-sheet; regulating soil moisture content, taking wild woody sweet potato vines and woody prickly pear pest-free peripheral branches, cutting, and spreading; and regulating greenhouse temperature, and planting prickly pear.    USE - Method for interplanting prickly pear and wild sweet potato on saline soil (claimed).    ADVANTAGE - The method improves quality of wild sweet potato fruit.    DETAILED DESCRIPTION - Interplanting prickly pear and wild sweet potato on saline soil comprises taking phosphogypsum, drying, milling to obtain powder, adjusting saline-alkali soil moisture content to 40-45%, mixing phosphogypsum powder at 350-1800 kg/acre, fertilizer oil cake at 500-1500 kg/acre and microbiological mushroom residue at 400-1000 kg/acre into saline soil, rotary processing, covering with film for 14-30 days, removing film, and leaching; preparing site by applying rot fertilizer uniformly into treated saline-sheet, taking potassium dihydrogen phosphate, urea and urea formaldehyde at 300-600 kg/acre, rotary processing, and constructing trail; ending site preparation after 30-60 days, regulating soil moisture content to 40-60%, taking wild woody sweet potato vines, cutting into 6-10 cm, picking robust and woody prickly pear pest-free peripheral branches, cutting into 9-15 cm, soaking cuttings into rooting powder for 30-40 minutes, and spreading cuttings into site surface; and regulating greenhouse temperature at 15-20 degrees C, adjusting humidity to 70-80% and moisture content of surface soil to 30-40%, holding for two months, removing shade shelters, planting prickly pear, adding plant ash, urea and compost manure at 0.2-0.4 kg/seedlings, and adding potassium dihydrogen phosphate, potassium nitrate, rot fertilizer and urea formaldehyde at 0.3-0.6 kg/plant during flowering of prickly pear.