The utility model provides a belt circuit detection device, it installs netted conveyer belt including frame, frame top, is equipped with detection mechanism in conveying belt output end's the frame, and the equipartition has a plurality of circuit board fixture of group on the conveyer belt zone face, and conveyer belt one side of detection mechanism below is equipped with non -defective unit climbing mechanism and defective products climbing mechanism, is equipped with the non -defective unit collecting vat in the frame of non -defective unit climbing mechanism below, is equipped with the defective products collecting vat in the frame of defective products climbing mechanism below. Have simple structure after this scheme of adoption, detect fast, efficient advantage.