A processing method of eichhornia bio-fermentation feed comprises crushing eichhornia and dehydrating until the water containing weight by percent is 40%-50%; adding bacillus flora powder of 0.5 part by weight into water of 8-18 parts by weight so as to make water solution with bacillus flora; adding the water solution of 8-18 parts by weight and with the bacillus flora into the crushed and dehydrated eichhornia of 1,000 parts by weight, simultaneously adding fish meal of 10-20 parts by weight and bean pulp of 5-10 parts by weight, evenly mixing, stacking for 40-56 hours for fermentation, controlling temperature of biological feed raw materials between 37 DEG C and 45 DEG C, mixing energy feed of 800-1,200 parts by weight into fermentation raw materials of 1,000 parts by weight, and obtaining the eichhornia bio-fermentation feed. The processing method of the eichhornia bio-fermentation feed and a product enable nutrition of the feed to be rich, enable amino acid to be complete, enable palatability to be good, enable feed consumption of animals to be large, and enable feed cost to be low.