The invention discloses a broad bean yield-increase biological fertilizer including the components in parts by weight: 500 parts of urea, 200-250 parts of diammonium phosphate, 10-20 parts of zinc sulfate, 10-20 parts of potassium sulfate, 8-12 parts of humic acid, 8-12 parts of sodium selenite, 10-20 parts of onion, 5-15 parts of purslane, 5-15 parts of bamboo leaves, 4-6 parts of cordate houttuynia, 4-6 parts of ginger, and 1-3 parts of a compound microbial fluid. The broad bean yield-increase biological fertilizer provided by the invention contains a variety of fertilizers, has rich nutrition, can meet needs of broad bean plants on various nutrition elements, and fundamentally improves the nutritional status and comprehensive resistance of the broad bean plants so as to improve the yield of broad bean; by mutual cooperation of the pyrethrum, purslane, bamboo leaves, onion, ginger and various insect-expelling Chinese herbal medicines, the fertilizer further enhances the resistance of the broad bean, improves the ability of the broad bean to resist diseases and insect pests, avoids or reduces the use of pesticides and other insecticidal fungicides, is safe and effective, and avoids from affecting human body health.