Spring clamp in copper-aluminum compound busbar casting system

The invention discloses a spring clamp in a copper-aluminum compound busbar casting system, wherein when a pair of claw clamps are in an open state, clamping openings are arranged outwards; the distance between the end surfaces of long clamping arms on the claw clamps is equal to the width of the copper-aluminum compound busbar; the distance between the end surfaces of short clamping arms on the claw clamps is less than the width of the copper-aluminum compound busbar; the outer side limiting part of a rotary shaft rod tightly props against the outer side blocking part of a clamping seat; a first limiting part of a rotary member tightly props against the outer edges, which are away from a base part, of the short clamping arms; the rotation points of a sliding rod and the rotary member are arranged inwards relative to the sliding rod and the rotary member; when the claw clamps are in a closed state, the clamping openings of the claw clamps are closed together to form a clamping space for clamping the copper-al