The invention discloses a railway wagon bogie normal position detection device. The complete machine is composed of a main machine body and a detection mechanism, wherein the main machine body is welded by profile steel, and the detection mechanism is located at four corners of the main machine body; a bogie support is arranged above the detection mechanism, and a detected workpiece bogie is placed on the bogie support; the detection mechanism is externally provided with a protective cover, the protective cover is internally equipped with a bracket, and the bracket is equipped with a linear guide rail, a cylinder 1 and a cylinder 2; the linear guide rail is provided with a sliding base 1 and a sliding base 2; the sliding base 1 is equipped with a measuring rod 1 and a displacement sensor 1, and a piston rod of the cylinder 1 is connected with the sliding base 1; the sliding base 2 is equipped with a measuring rod 2 and a displacement sensor 2, and a piston rod of the cylinder 2 is connected with the sliding base 2; both the upper part of the measuring rod 1 and the upper part of the measuring rod 2 are equipped with a detection plate, each detection plate is articulated through a hinge pin; and the displacement sensors, the cylinders, the linear guide rail and the like in the detection mechanism are installed below the detection position and away from the detected workpiece bogie, and the measuring rods and the detection plates go deep into the measured position of the workpiece to complete the measurement, so that the measurement range is increased.