The utility model discloses a 110kV transformer magnetizing inrush current suppression device which comprises a quick switch and a controller system, the quick switch is connected between the high-voltage side of a 110kV transformer and an isolating switch, and the controller system controls the switching-on and switching-off operation of the quick switch. According to the method, a no-load transformer is closed by adopting a phase-selecting closing technology, the closing time of the magnetizing inrush current suppression device of the transformer is controlled through split phases, and the transformer is switched on when the pre-induced magnetic flux is equal to the existing magnetic flux in an iron core. On the premise that the working flux of the transformer is not reduced and the performance and the working mode of the existing circuit breaker are not changed, the excitation surge current is limited, the protection maloperation is eliminated, the electric energy quality is improved, and the operation reliability of equipment and a power grid is improved, thereby having important significance.