Battery case welding clamp

The utility model discloses a battery case welding fixture, which comprises a bottom board and a vertical board fixed on the bottom board, wherein, a bottom block that can hang and support a barrel-shaped semi-finished product of a battery case is fixed on the vertical board, a pushing pressure cylinder is fixed on the bottom board, a piston rod of the pushing pressure cylinder is fixed with a pressure block matching with the bottom block to cause the two edges of the edge joint of the barrel-shaped semi-finished product to be positioned in a same plane. A chock block that is positioned at one side of the bottom block and can withstand the barrel-shaped semi-finished product is arranged on the pressure block in a protruding way. A thrust pressure cylinder is arranged on the part at one side where the bottom board is opposite to the chock block along the bottom board, a piston rod of the thrust pressure cylinder is fixed with a push block matching with the chock block to lead the two edges of the edge joint to