The invention discloses a foreign body intrusion signal acquisition device, comprising cables (1), a foreign body inductive mesh (4) and a plurality of wire cutting devices (5), wherein the wire cutting devices are provided with cable penetrating holes (7) and foreign body inductive mesh fixing holes (6); the cables (1) penetrate through the cable penetrating holes (7) of the wire cutting devices(5) and are connected with a foreign body intrusion monitoring system machine room (3); the foreign body inductive mesh (4) is tensioned and connected with the wire cutting devices (5) through the foreign body inductive mesh fixing holes (6) for inducting the impact force in case of foreign body intrusion and driving the wire cutting devices (5) to cut off the cables (1), thereby transmitting thecontrol signal to the foreign body intrusion monitoring system machine room (3). The foreign body intrusion signal acquisition device can timely and accurately detect the intrusion of the foreign bodies, transmits the control signal to the foreign body intrusion monitoring system machine room and ensures the driving safety of the high-speed railway or expressway. When a plurality of cables are arranged at different areas of the foreign body inductive mesh, the large-sized foreign bodies can be accurately detected out.