The invention relates to an electromagnetic ultrasonic probe which is characterized by comprising a preposition amplifying module, an isolating layer, a shell, a receiving coil and a permanent magnetic device; the top face of the shell is provided with a poking switch, a power line interface and a BNC connector, the inner side of the bottom face of the shell is provided with the isolating layer, the centers of the two side faces of the shell are provided with holes respectively, the preposition amplifying module is located in the shell and fixed to the inner side of the top face of the shell through a screw, and the receiving coil is pasted to the isolation layer; the receiving coil is connected with the input end of the preposition amplifying module through a signal line, the output end of the preposition amplifying module is connected with the BNC connector fixed to the shell, the poking switch controls the gear position of the preposition amplifying module, and the power line connector is connected with an external power source; the permanent magnetic device comprises a permanent magnetic body, a first curved magnetic boot, a second curved magnetic boot, a cross coupling and a mechanical knob, a permanent magnetic device is located between the two curved magnetic boots, and the middle of the permanent magnetic body is provided with a cross hole groove.