The invention discloses a control system for a baby swing. The control system comprises a driving motor for applying a force and a control device for controlling the driving motor. The control device comprises a gyroscope disposed on a swing arm for detecting an angular velocity of the swing arm when the swing arm passes the lowest point and outputting an angular velocity detection signal; and a control module coupled to an output end of the gyroscope for receiving and responding to the angular velocity detection signal, so as to adjust a duty ratio of the driving motor in energization and change the action time of the driving motor. The control system for the baby swing according to the invention achieves the same swing angle for babies of different weights.