The invention discloses a laser real-time feedback control system and a control method thereof. The control system comprises a mechanical arm, a laser welding head and a three-dimensional imager, wherein the laser welding head is disposed on the mechanical arm, and the three-dimensional imager is disposed on the mechanical arm and used for shooting the real-time welding joints of the laser welding head. The control method includes the steps of firstly, machining standard welding joints, using the three-dimensional imager to shoot the standard welding joints to obtain real-time images, uploading the images to a smart mainframe for storage, and by the smart mainframe, recording the images as standard parameters; secondly, during laser welding, using the three-dimensional imager to shoot real-time welding joints, uploading the images to the smart mainframe for storage, and by the smart mainframe, performing data analyzing and processing on the real-time welding joint images and recording as real-time parameters; thirdly, by the smart mainframe, comparing each real-time parameter and the corresponding standard parameter. The method is universally applicable to laser welding production of various materials, and whether the real-time welding joints are qualified or not can be judged effectively.