A child safety seat is provided and includes a base, a seat body and a notifying system. The seat body is movable relative to the base between a first position and a second position. The notifying system includes at least one actuated device disposed on one of the base and the seat body, an actuating component disposed on another one of the base and the seat body, and a notifying device electrically connected to the at least one actuated device. When the seat body reaches at least one of the first position and the second position, the actuating component actuates the at least one actuated device, so that the at least one actuated device is actuated to generate different types of actuating signals. The notifying device generates different types of notifying signals when the at least one actuated device generates the different types of actuating signals.