The invention relates to a slope cropland construction method for recycling captured nitrogen and phosphorus, and belongs to the field of agricultural environmental protection. The slope cropland construction method includes the steps: planting mode selection; ridge height setting; surface covering; runoff child-mother pond constructing and mounting, nitrogen and phosphorus catcher constructing and mounting; water pump constructing and mounting. According to the slope cropland construction method, distribution of an existing slope cropland can be utilized according to local conditions, directsurface runoff and underground leaching of a farmland are collected, non-point source pollution of a slope cropland is reduced, and potential water and sediments rich in nitrogen and phosphorus serving as non-point source pollution sources of a rainy season farmland are effectively utilized. Irrigation water shortage caused by uneven rainy season moisture is adjusted, the self-cleaning capacity ofslope cropland non-point source pollution is improved, nitrogen and phosphorus nutrients are recycled, and the method has great significance and wide market application prospects.