The invention discloses a complex microbial agent capable of purifying air and application thereof. The complex microbial agent is prepared from, by weight, 7-15 parts of pseudomonas, 7-15 parts of saccharomycetes, 6-14 parts of Opitutales, 5-12 parts of rhizobium, 4-12 parts of rhodospirillum, 4-12 parts of rhizopus oryzae, 2-9 parts of micrococcus, 2-8 parts of bacteroides, 2-9 parts of clostridia, 2-8 parts of bacillus cereus, 1-7 parts of alcaligenes, 1-7 parts of streptomycete, 1-7 parts of rhodocyclus, 1-6 parts of galactococcus, 1-6 parts of mycobacteria, 1-6 parts of burkholderiales, 1-6 parts of lysobacter, 1-5 parts of hydrogenophilus, 1-5 parts of xanthomonas, 1-5 parts of brevundimonas, 0.1-3 parts of comamonas and 0.1-3 parts of aspergillus. The complex microbial agent utilizes the synergistic effect of powerful bacteria, it is promoted that microorganisms utilize and perform metabolism decomposition on volatile organic compounds in the air, so that the efficient elimination and reduction of contaminants are achieved.