the present invention provides an attenuated strain of porcine pseudorabies virus , in which said attenuated strain of prv is a variant strain of prv with inactivation of gi / ge / 11k / 28k proteins . in addition , the present invention also provides a vaccine composition comprising the attenuated strain of prv as an antigen , a preparation method and use thereof . proved by immunogenicity and pathogenicity testing of the live vaccine , said live prv vaccine can provide a good protection for pigs with no clinical signs observed , indicating excellent immune protection .