The invention provides a locomotive signal information detector, which comprises a locomotive signal host machine, a signal display and an adapter, wherein the locomotive signal host machine is respectively and electrically connected with the signal display and the adapter. Through the adoption of the locomotive signal information detector of the invention, the accurate automatic detection on locomotive signals in a signal machinery room can be realized, in addition, the locomotive signals in different systems can be conveniently and automatically detected, and the invention brings great convenience for locomotive signal maintenance personnel to timely discover and handle the locomotive signal fault.