The invention discloses a compound cultivation nutrient liquid for flower bonsai, and the compound cultivation nutrient liquid comprises the following raw materials by weight: 10-30 parts of an agricultural organic mixture, 1-3 parts of yeast, 5-7 parts of ammonium nitrate, 3-6 parts of potassium nitrate, 2-4 parts of potassium dihydrogen phosphate, 8-10 parts of ammonium sulfate, 10-18 parts of calcium nitrate, 1-2 parts of manganese sulfate, 0.8-1.3 parts of zinc sulfate, 0.2-0.5 part of potassium iodide, 0.8-1.4 parts of aluminum chloride, 0.05-0.55 part of a growth hormone supplement, 15-21 parts of a nutrition element supplement, 3-5 parts of rare earth, 8-10 parts of a film-forming agent and 500-600 parts of pure water. The compound cultivation nutrient liquid has balanced nutrition and high nutrient content, can significantly improve wetting and penetration of the nutrients in the leaf surface of woody flower bonsai plants when in use by spraying, improves the utilization rate, can improve the biochemical and biological properties of a matrix when in use by irrigating, can replenish nutrients timely in the key growth and development period of woody flowers, and can promote crop growth and development and flowering; the raw materials for the preparation are environmentally friendly, non-toxic, and easily available, and the compound cultivation nutrient liquid has the advantages of low production cost, simple process, high practical value and good application prospect.