The invention belongs to the field of feed production and processing and particularly relates to a Chinese herbal medicine fermented feed additive for pigs to resist heat stress. The invention provides a novel Chinese herbal medicine fermented feed additive for pigs to resist heat stress. The Chinese herbal medicine fermented feed additive is prepared from mint leaves, sea-ear shell, lotus leaves, honeysuckle flowers, herba scutellariae barbatae, radix astragali, lily bulb, fructus crataegi, herba lamiophlomis, rhizoma pinelliae, rhizoma curcumae longae, goldthread roots, magnolia bark, spreading hedyotis herb, lucerne, cicada ecdysis, herba cistanche, rhizome of chuanxiong, herba malachii aquatici, cassia twig, magnolia vine fruit, radix aucklandiae and rhizoma alismatis. The Chinese herbal medicine fermented feed additive has quite high animal disease resistance, has the effects of promoting animal growth, improving the survival rate and reducing the diarrhoea rate, and thus has quite obvious popularization value.