The invention relates to a control device for line inrush current. The control device comprises a casing, wherein a nameplate instruction and a dial switch are arranged above a boss on the front sideof the casing; the dial switch is connected with a circuit board inside the casing through a wire; mounting boards are arranged at the upper end and the lower end of the casing. When a circuit breakeris closed or a power grid is in a working state and exciting current is formed on a line, the control device for the line inrush current can detect line current, delay tripping control and prevent maloperation tripping of the circuit breaker by excitation. By adopting a microcontroller technology, when current exceeds setting current with a set multiple, current properties are immediately judged,and instantaneous over-current protection is performed, and delay duration can be set according to the requirements.