Protection device for detector

The utility model discloses a protection device for a detector. The protection device comprises a tube body and a tapered metal head. One end of the tube body is fixedly connected with the end face of the tapered metal head. Therefore, the protection device for the detector can be reused in tunnel geological prediction prospecting to lower cost; in addition, the interference of sound waves and surface waves in a tunnel to the detector also can be effectively reduced, and detection accuracy is improved; and moreover, the device also has the advantages of low difficulty in machining and batch production.