Signal detection device

The utility model relates to the technical field of material detection and particularly relates to a signal detection device. The signal detection device comprises a touch structure, a transmission structure, a signal baffle and a proximity switch, wherein the touch structure is mounted on the transmission structure, the transmission structure is fixedly connected with the signal baffle, and the proximity switch is arranged on the signal baffle along the vertical direction. According to the signal detection device provided by the utility model, the position of a steel plate can be detected in real time, the quenching quality of the steel plate is improved, and meanwhile, the scratch to the lower surface of the steel plate and the bruise to a furnace door can be prevented.