A child safety seat and a seat base for the child safety seat are provided. The seat base includes a buckling mechanism, an indication mechanism, and a linkage mechanism. The buckling mechanism is configured to buckle into a seat body. The indication mechanism includes an indication area, which is configured to indicate a buckling state of the seat base and the seat body. The linkage mechanism is disposed between the buckling mechanism and the indication mechanism. When the buckling mechanism is buckled into the seat body, the linkage mechanism drives the indication area to present a first indication state; and when the buckling mechanism is unbuckled from the seat body, the linkage mechanism drives the indication area to present a second indication state.