The invention discloses a cutting device for a solder strip. The cutting device for the solder strip comprises a base seat, a conveying mechanism and a cutting mechanism, wherein the conveying mechanism and the cutting mechanism are installed on the base seat; the conveying mechanism comprises a conveyor belt, driven pulley sets, a driving pulley and a motor, wherein the conveyor belt winds on the plurality of driven pulley sets and the driving pulley to form an input part and an output part, the output end of the motor is connected with the driving pulley; the cutting mechanism comprises a lower parting tool, an upper parting tool, a parting tool support and a driving mechanism, wherein the hollow parting tool support is arranged between the input part and the output part formed by the conveyor belt, the lower parting tool is fixedly arranged on the hollow bottom surface of the parting tool support, the upper parting tool is arranged over the lower parting tool, the lower parting tool and the upper parting tool are perpendicular to the conveying direction of the conveyor belt, and the driving mechanism enables the upper parting tool to be attached to the lower parting tool. The cutting device for the solder strip has the characteristics of synchronous drive of battery strings and high cutting accuracy.