The invention discloses a track gauge detection vehicle. The track gauge detection vehicle comprises a vehicle body assembly and a ranging rod; the ranging rod is positioned at the bottom of a vehiclebody; the ranging rod comprises a rod body, slide blocks, a clamping seat, a detection head, a spring and a pull rod; the rod body is fixedly connected with the bottom of the vehicle body and perpendicular to the running direction of the vehicle; the slide blocks are symmetrically arranged on the top surface of the rod body in a sliding manner; the clamping seats are symmetrically arranged on thetop surface of the rod body, fixedly connected with the top surface of the rod body and positioned on the external sides of the slide blocks; the detection heads are symmetrically arranged on the bottom surface of the rod body in a sliding manner and flexibly connected to the slide blocks by being wound on the clamping seats; one ends of the springs are connected to the slide blocks; the other ends of the springs are connected to the pull rod; and the pull rod is vertically arranged at the center line of the bottom of the vehicle body. The track gauge detection vehicle is used for replacing amanual point taking measuring method so that the detection is more timely and comprehensive and the detection result is more visual; and meanwhile, the working efficiency is enhanced, and the operation environment of workers is improved.