The utility model discloses an oscillatory scanning laser beam-electric arc hybrid welding system comprising a laser, a welding machine, a vibrating mirror controller, a numerical control system, a motion mechanism, and a hybrid welding machining head. The numerical control system is in electric signal connections with the laser, the welding machine, the vibrating mirror controller, and the motion mechanism. The laser is in an optical connection with a vibrating mirror focusing device via a transmission mirror set or a transmission optical fiber, the motion mechanism is used for installing the hybrid welding machining head or a workpiece so that the motion of the hybrid welding machining head or the workpiece is realized, the vibrating mirror controller, for setting and controlling the scanning pattern, the amplitude, and the oscillation frequency of laser beams, is connected with the vibrating mirror focusing device, and the hybrid welding machining head is used for the recombination of the laser beams and the electric arc. Compared with the prior laser-electric arc hybrid welding and laser scanning welding system, the oscillatory scanning laser beam-electric arc hybrid welding system is advantaged by stronger weld porosity inhibition ability and improved weld strength.