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The application relates to a vehicle frame pin welding auxiliary device and belongs to the technical field of welding. The vehicle frame pin welding auxiliary device comprises a welding robot and a position changing mechanism installed on a base. The position changing mechanism comprises a clamping plate, a pushing assembly and a clamping assembly. The clamping plate is connected to the base. The pushing assembly and the clamping assembly are installed on the clamping plate. Positioning blocks are connected to the clamping plate. The positioning blocks are used for placing workpieces. The pushing assembly is used for pushing the workpieces to the clamping assembly. The clamping assembly is used for positioning the workpieces on the clamping plate. A plurality of positioning blocks are arranged on the clamping plate. The clamping plate places the workpieces through the positioning blocks. The plurality of workpieces are pushed by a pushing plate, so that the end portions of the plurality of workpieces are aligned, thereby facilitating subsequent welding of the workpieces by the welding robot. V-shaped blocks for placing the workpieces are arranged on the clamping plate. The clamping assembly also comprises V-shaped blocks for clamping the workpieces. This facilitates clamping of workpieces with different diameters.