The invention discloses a pepper flower and fruit retention nutrient. The pepper flower and fruit retention nutrient is prepared from corn straw, corn cobs, fungus dregs, bagasse, watermelon peel, sweet potato dregs, coconut shells, Chinese wax gourd peel, banana skin, cassava residues, distiller's grains, yeast, lotus root residues, lactic acid bacteria, acetic bacteria, garlic, chilli, pepper, pepper leaves, monopotassium phosphate, ammonium sulfate, iron sulfate, manganese sulfate, copper sulfate, borax, zinc sulfate and sodium selenite. The pepper flower and fruit retention nutrient is easy to prepare, low in cost, balanced in nutrition and small in use amount, and meets the requirements for nutrients in the blooming and fruit bearing periods of pepper, more flowers and fruits are promoted to be generated, the fruit bearing period is prolonged, and the yield is increased by 16-18%; antifungal pesticide is traditional Chinese medicine extract, no drug resistance is generated, the price is low, the use amount of pesticide is reduced, and the quality of the pepper is improved; an organic nutrient is a fermentation product, is safe and free of toxins, and coordinates with an inorganic nutrient to promote absorption, fermentation residues are applied as organic fertilizer, and the utilization rate of the nutrient is increased.