The invention discloses a kit and a detection method for a detecting porcine reproductive and respiratory syndrome virus. An enzyme-linked reaction plate, an enzyme label conjugate, a concentration washing solution, a substrate solution, a developing solution, a concentrated sample diluents, and a stop buffer are arranged in a kit body; the kit is characterized in that the enzyme-linked reaction plate coats a polyclonal antibody of porcine reproductive and respiratory syndrome virus N protein; the enzyme label conjugate is an enzyme label conjugate of the polyclonal antibody of the porcine reproductive and respiratory syndrome virus N protein and is marked by horseradish peroxidase. By means of the sensitivity, specificity, practicability and economical efficiency of a rapid immune detection technology, the kit disclosed by the invention mainly has the advantages of being simple, convenient and fast to operate, and objective and reliable in result judgment, and as a convenient early screening tool, the sensitivity of the kit can reach 90% of the gold standard method PCR.