The invention provides an immunological preparation for preventing and treating porcine reproductive and respiratory syndromes. The immunological preparation comprises epimedium, sealwort, Gorgon fruits, ephedra herbs, centipeda minima, flatstem milkvetch seeds, forsythia, companumoea roots, cape jasmines, yams, tree peony bark, acanthopanax roots, curculigo orchioides, jasminum elongatum, clovers, meadowrue roots and rhizomes, mistletoes, rheum franzenbachii, adenophora tetraphylla and alpinia oxyphylla. The immunological preparation has the advantages that cellular immunity and humoral immunity of organisms can be enhanced through the organism regulation effect, immune cells are activated, interferons are induced, viruses cannot survive and reproduce in porcine body cells, and the effect of resisting the porcine reproductive and respiratory syndromes is achieved.