Disclosed is a multi-gauge rail-converting device for wheel set production, the rail-converting device belongs to the technical field of the railway wheel set production. The device comprises a rotating disk, a rotation mechanism for driving the rotating disk to rotate at 90 degrees, a rotating disk, and railways installed on the ground. The device is characterized in that: the rotating disk is provided with six railways in parallel; the gauge between the first railway and the sixth railway is 1676 mm; the gauge between the first railway and the fifth railway is 1435 mm; the gauge between the first railway and the third railway is 1000 mm; the gauge between the sixth railway and the second railway is 1524 mm; the gauge between the second railway and the fourth railway is 1067 mm; Another six railways are also butted on the ground and are connected to the six railways on the rotating disk in the vertical direction, the six railways are connected to the railways on the rotating disk and are arranged in parallel. A carrying block is fixed at the crossing position between the two railways on the ground which are vertically arranged. The advantages of the multi-gauge rail-converting device of the utility model are that: the multi-gauge rail-converting device is suitable to the production requirement of the international-universal wheel set with five different gauges at the same time; the rail-converting operation is convenient and simple, the production effective is significantly enhanced, and the labor-intensity is reduced.