The invention provides a blumea-balsamifera leaf fertilizer. The blumea-balsamifera leaf fertilizer is prepared from, by mass, 17%-70% of marine-organism active polysaccharides, 9%-60% of humic acid, 1%-15% of vitamins, 1%-15% of inositol and 0.05%-3% of gibberellin. By means of the marine-organism active polysaccharides, the humic acid and the vitamins, nutrient components required by blumea-balsamifera growing can be supplemented in time, the photosynthetic activity of blumea balsamifera can also be improved, and the activity of terpene synthase such as L-borneol is promoted; by means of the inositol and the gibberellin, synthesis of endogenous hormones in the blumea balsamifera can be promoted, falling off is reduced, accumulation of the L-borneol is promoted, and the resistance of the blumea balsamifera to the extreme weather such as diseases and pests, cold and the high temperature is increased; leaf spraying is carried out in the blumea-balsamifera growing period and before harvesting, the biological yield of the blumea balsamifera is increased by 60% or above, and the yield of the blumea balsamifera is increased by 20% or above. A preparing method of the blumea-balsamifera leaf fertilizer has the advantages of being easy and convenient to operate, mild in technology condition, good in water solubility, convenient to spray, remarkable in economical benefit and the like.