Liquid-cooled side wall welding mould and using method

The invention discloses a liquid-cooled side wall welding mould and a using method, and relates to the field of railway wagon body manufacturing, a side wall comprises a side plate and side columns welded on the side plate at intervals, and the liquid-cooled side wall welding mould comprises a supporting mechanism, a plurality of tread supporting parts and a plurality of tread supporting parts, the cooling mechanism comprises a plurality of cooling assemblies, the cooling assemblies are arranged between every two adjacent tread supporting parts, and the cooling assemblies are used for making contact with the side plates; the conveying mechanism is arranged on one side of the supporting mechanism in a lifting mode, and the side plates can be lifted and conveyed after the conveying mechanism is lifted; the pressing mechanism is movably arranged, and a welding assembly is arranged on the pressing mechanism; the control unit is connected with the conveying mechanism, the cooling mechanism, the pressing mechanism