The invention discloses a method for producing organic multiple-complex feed additives with waste molasses as raw materials. The method is characterized in that the waste molasses are obtained via multiple complex reaction with trace elements prior to secondary fermentation with corn flour, bean dregs, rice bran and fermentative strains. The organic multiple-complex feed additives are prepared from, by weight, 10-25 parts of the waste molasses, 5-10 parts of the corn flour, 5-8 parts of the bean dregs, 5-8 parts of the rice bran, 0.1-1 part of the fermentative strains and 0.1-0.3 part of the trace elements; the trace elements include, by weight, 1-5 parts of ferrous sulfate, 1-4 parts of zinc sulfate, 2-5 parts of calcium oxalate, 2-5 parts of calcium oxalate, 1-4 parts of manganese sulfate and 0.5-1 part of copper sulfate. The situation that the feed additives are prepared from the by-product molasses of a sugar mill via complexation and secondary fermentation belongs to a project turning waste into treasure by recycling leftovers, and environmental protection is achieved no external discharge of waste residues; the trace elements are high in utilization and low in cost, sweet taste is obtained after fermentation, appetite of flocks and herds is improved after the feed additives are added in the feed, the flocks and herds like to eat the feed additives and grow rapidly.