Door-lock anti-destruction device for railway communication signal box-type machine room

The utility model relates to a door-lock anti-destruction device for a railway communication signal box-type machine room. The adopted technicial scheme is as follows: the device comprises a lock knob, a lock case, a lock pin and an outer lock, wherein a hole allowing the lock knob to pass through is formed on the lock case; the lock case is connected on the lock pin and can turn over around the lock pin; the lock knob and the lock pin are fixed on a door plate on the outer side of a thievery prevention lock for a door of the railway communication signal box-type computer room; and after the lock case turns over, the lock knob passes through the upper hole of the lock case, the outer lock is inserted into the lock knob, and then the door-lock anti-destruction device is in a locking protection status. The door lock destruction prevention device can cover the keyhole of the thievery prevention lock (inner lock) of the door of the machine room so as to avoid the artificial destruction from directly contacting wi