Welding detection system and welding detection method

The invention discloses a welding detection system and a welding detection method.The welding detection system comprises at least one detection mechanism, the detection mechanism comprises a first movement mechanism, a second movement mechanism and a third movement mechanism, the first movement mechanism comprises a first movement frame capable of moving in the first direction, and the second movement frame comprises a second movement frame capable of moving in the second direction; the second movement mechanism comprises a second movement frame which is arranged on the first movement frame and can move in the second direction, the third movement mechanism comprises a third movement frame which is arranged on the second movement frame and can ascend and descend in the third direction, and every two of the first direction, the second direction and the third direction are perpendicular; the visual mechanism comprises a first visual module and a second visual module which are arranged on the third moving frame, and the second visual module can rotate around a rotating shaft in the third direction, so that the shooting angle of the second visual module is changed; and the first visual module and the second visual module can follow the second moving frame to perform position switching between the first image acquisition point position and the second image acquisition point position in the second direction.