The invention discloses a veterinary drug for treating cow infertility. The scheme comprises the following steps: (1) selecting poria cocos, plantain herb, serissa japonica, angelica sinensis, salvia miltiorrhiza, dipsacus asperoides, flatstem milkvetch seeds, semen cuscutae, flos chrysanthemi, rhizoma cyperi, lycium barbarum, radix astragali, rhizoma atractylodis macrocephalae, radix angelicae, rhizoma dioscoreae, radix paeoniae alba, charred fructus crataegi, liquorice, a micro-ecological preparation and an enzyme preparation; and (2) adding the Chinese herbal medicines into a pulverizer and processing into powder with particle size of 30-200 meshes; sieving; adding 0.5 part by weight of micro-ecological preparation and 0.05 part by weight of enzyme preparation and mixing uniformly; and finally, granulating to finish the preparation. The veterinary drug disclosed by the invention conforms to the industrial policy of national veterinary drug development, meets the requirement for production of pollution-free food without antibiotic residue, and meets the requirements for developing scientific and technological enterprises and enhancing the innovation ability of the enterprises.