The utility model provides an integrally sealed dual detector which solves the technical problems of poor sealing performance caused by the unstable quality and aging of O-shaped sealing rings, and poor anti-interference performance caused by the silicone oil leakage, and short service lifetime existing in a conventional dual detector. The integrally sealed dual detector is provided with an external housing. The inside of the external housing is provided with a main rotary hull. The main rotary hull is provided with a detector core. One side of the external housing is provided with an outgoing cable and a sealing bulkhead, and the other side is provided with a hydrophone probe. The outside of the external housing and the outside of the hydrophone probe are provided with an external protection shell. The external protection shell is connected with the sealing bulkhead. The integrally sealed dual detector can be widely applied to the detector field.