The utility model relates to a cable support device, specific theory relates to an electric power cable bracket for tunnel. Including relative two support frames that set up, the support frame is constituteed by erecting the cross arm that support and a plurality of be used for placing the cable, erect the support and can hug closely the surface in tunnel, erect the support lower extreme through with the tunnel structure base member in precasting structure pass through welded connection, it is equipped with a plurality of round holes to erect the stake body, be equipped with a plurality of round holes on the cross arm, cross arm one end is equipped with and supplies to erect the support inserted matched with recess, behind the perpendicular support inserted recess, the round hole and the cross arm round hole on the surface that erect on the frame body surface pass through bolted connection, fix the cross arm on erecting the support. The utility model discloses erect the support not with cross arm fixed connection, cable support simple to operate.