NOVELTY - Complex probiotics, is claimed. The probiotic is prepared by activating nitrogen fixing bacteria, Rhodopseudomonas palustris, Bacillus subtilis, Lactobacillus acidophilus and Saccharomyces cerevisiae in a slant in cryopreservation tubes, respectively culturing to obtain respective bacterial liquids, inoculating nitrogen fixing bacteria and R. palustris liquid into sterilized fermentation culture medium, culturing, inoculating L. acidophilus and S. cerevisiae to obtain primary complex probiotic seed and culturing in another medium.    USE - The complex probiotic is useful for processing pig excrement (claimed).    ADVANTAGE - The complex probiotic processes livestock excrement, thus avoiding secondary pollution, and enabling the production of an organic fertilizer with high fertility and low cost in a short period of time.    DETAILED DESCRIPTION - Complex probiotic, is claimed. The probiotic is prepared by (a) activating nitrogen fixing bacteria, Rhodopseudomonas palustris, Bacillus subtilis, Lactobacillus acidophilus and Saccharomyces cerevisiae in a slant in cryopreservation tubes, respectively placing in 90 mm culture dish to purify to obtain respective strains, (b) inoculating nitrogen-fixing bacteria into a sterilized liquid culture medium I, aerobically culturing for 1-2 days at 25-27 degrees C to obtain nitrogen-fixing bacteria bacterial liquid, inoculating R. palustris into a sterilized liquid culture medium II, anaerobically culturing at 28-30 degrees C for 5-7 days to obtain R. palustris bacterial liquid, inoculating Bacillus subtilis into sterilized liquid culture medium III, culturing at 30 degrees C for 1-2 days to obtain Rhodopseudomonas palustris bacterial liquid, inoculating L. acidophilus into sterilized liquid culture medium IV, anaerobically culturing at 37 degrees C for 1-2 days to obtain L. acidophilus bacterial liquid, inoculating Saccharomyces cerevisiae into sterilized liquid culture medium V, and aerobically culturing at 28-30 degrees C for 3 days to obtain Saccharomyces cerevisiae liquid, (c) mixing the liquids in a ratio of 2:2:2:1:1, inoculating into sterilized fermentation culture medium I, aerobically culturing at 30 degrees C for 3 days, inoculating L. acidophilus and R. palustris liquid, anaerobically culturing at 37 degrees C for 3 days to obtain primary complex probiotic seed, (d) inoculating 5% primary complex probiotic seed into sterilized fermentation culture medium II, first aerobically culturing at 30 degrees C for 3-5 days and anaerobically culturing for 3-5 days to obtain secondary complex probiotic seed, and (e) inoculating 5% secondary probiotic seed into sterilized fermentation culture medium III, firstly aerobically culturing at 30 degrees C for 3-5 days and anaerobically culturing for 3-5 days to obtain finished product.