Underframe spot-welding workstation and underframe spot-welding system

The embodiment of the invention provides an underframe spot-welding workstation and an underframe spot-welding system, and relates to the field of automobile automation production devices. The underframe spot-welding workstation comprises a truss robot, a spot-welding robot and a welding mechanism, wherein the welding mechanism comprises a track system and at least two manipulators; the at least two manipulators are arranged on the track system at an interval and can move relatively through the track system; the truss robot is arranged above the welding mechanism and is used for grabbing raw materials to be welded on the at least two manipulators or raw material to be welded fixed by the manipulators one by one; the manipulators are used for grabbing and fixing the raw materials to be welded; the spot-welding robot is arranged close to the welding mechanism and is used for welding the adjacent raw material to be welded; and the manipulators are further used for lifting the raw materials to be welded after wel