The invention discloses a recombinant adenovirus, which is obtained by fusing and connecting an open reading frame 2 (ORF2) of an immunogenicity protein gene of porcine circovirus type 2 (PCV2) and a signal peptide-removed porcine interferon-gamma (IFN-gamma) gene and then recombining the fused and connected genes to an adenovirus vector. The ORF2 of the main immunogenicity protein of the PCV2 and the signal peptide-removed porcine IFN-gamma are fused with each other and then are expressed in the adenovirus, so that the immunogenicity of the ORF2 is improved and the immunity effect is enhanced compared with the single ORF2. The obtained recombined adenovirus, serving as vaccine, can be applied to epidemic prevention of the porcine circovirus.