The invention discloses a kit for detecting porcine circovirus II-type IgM antibody ELISA (enzyme-linked immunosorbent assay). The kit comprises an antigen coating microporous plate, an HRP marked indicating antigen, standard positive and standard negative control serums, a substrate, a scrubbing solution and a stop buffer, wherein the antigen coating microporous plate is recombinantly expressed by escherichia coli (E.coli) by constructing series epitope proteins, the series epitope proteins with high affinity activity and specificity such as CapEpi II and CapEpi IV are sieved, the CapEpi II is taken as an IgM capturing antigen, and the antigen coating porous plate is obtained by coating the porous plates with 96 holes overnight at the temperature of 4 DEG C with the concentration of 37.5ng/mL; and the HRP marked indicating antigen is obtained by using the HRP to mark the CapEpi IV and titrate an optimal working concentration through the known IgM positive serum, so as to serve as theIgM indicating antigen. The kit has preferable sensitivity and specificity, does not need to dilute a serum to be detected, is simple in operation, and is applicable for rapid detection for mass field samples; and the generation of IgM after PCV2 infection can be effectively detected.