Sheet metal welding clamping device

The utility model discloses a sheet metal welding clamping device which comprises an installation support, two supporting plates and an angle adjusting device, the two supporting plates are symmetrically distributed in an inverted-V shape, the inclined upper ends of the supporting plates are horizontally and rotationally connected with the top of the installation support, and the angle adjusting device is installed on the installation support and used for adjusting the included angle of the two supporting plates. The adjusting mechanism comprises a sliding sleeve and at least one pair of first supporting arms, the sliding sleeve and the mounting support can be vertically adjusted in a sliding mode, the first supporting arms are symmetrically distributed in a V shape, the lower ends of the first supporting arms are rotationally connected with the sliding sleeve, the upper ends of the first supporting arms are rotationally connected with the two supporting plates respectively, and a limiting device is fixedly i