Electromagnetic ultrasonic and eddy current composite sensor and thickness gauge with same

The invention provides an electromagnetic ultrasonic and eddy current composite sensor and an electromagnetic ultrasonic and eddy current composite thickness gauge. The sensor comprises a shell, a magnet, an electromagnetic ultrasonic coil, an eddy current coil and an interface, the electromagnetic ultrasonic coil is arranged at one end of the magnet; the eddy current coil surrounds the magnet and comprises P eddy current transmitting coils and Q eddy current receiving coils, the number of the eddy current transmitting coils is P, and the number of the eddy current receiving coils is Q; and the interface is arranged on the shell and is electrically connected with the electromagnetic ultrasonic coil and the eddy current coil. According to the composite sensor provided by the invention, the eddy current transmitting coil and the eddy current receiving coil are wound on the magnet, so that the internal space of the sensor is saved, and meanwhile, the structural form of the eddy current transmitting coil and the