The invention relates to a dual sensor, which solves the technical problems that the structure of an existing dual sensor is complex, the phenomena that the contact resistance increases and the contact is poor can occur after the use of a sliding lead device for a long time and the technology is complex, the reliability is low and the phenomena of short circuit and open circuit can occur easily during the batch production. The dual sensor comprises a detector, a hydrophone and a main rotating hull, wherein bearing pedestals are arranged on two sides of the main rotating hull; bearings are arranged on the bearing pedestals; signal output lines are connected onto the detector and the hydrophone respectively; and electronic slip rings are arranged on outer sides of the bearing pedestals. The dual sensor can be widely applied to dual sensors.