The invention discloses a welding device for metalworking practice teaching of college students. The welding device comprises a bearing base, damping parts, a welding operation table, a workpiece fixing mechanism, a welding tail gas treatment device, a rack, a slide sleeve, a connector, a transparent protective cover and a telescopic air cylinder, wherein the bottom of the bearing base is fixedlyequipped with the four damping parts; the top of the bearing base is fixedly equipped with the welding operation table; a workpiece fixing mechanism is arranged on the welding operation table; and a rack is fixedly mounted on the bearing base at opposite two sides of the welding operation table. The welding device is reasonable and simple in structure, is convenient to use, is energy-saving and environmentally-friendly, is convenient for welding operation of students, improves welding teaching efficiency, realizes manual fixing on welded workpieces by the students, exercises operation abilityof the students, isolates a welding operating environment, effectively improves welding teaching safety, and avoids pollution, on environment, of welding tail gas, so that environment friendliness ofthe welding device for metalworking practice teaching can be effectively improved.