The invention discloses a ventilating system for a child safety seat and the child safety seat. The child safety seat comprises a seat main body; the seat main body comprises a seat part and a backrest part; the seat part comprises a seat plate, and the backrest part comprises a backrest plate; the ventilating system comprises air flue shell bodies arranged at the bottom part of the seat part andthe back part of the backrest plate and provided with multiple air flues, multiple ventilating holes arranged on the seat plate and the backrest plate and corresponding to the air flue, and fans; theair flues are connected to the ventilating holes, and multiple air flues are connected to each other; air inlets of the air flue shell bodies are connected with the air outlets of the fan through theventilating pipe; sealing structures for preventing air flow leakage are arranged between the air flue shell bodies and the seat plate and between the air flue shell bodies and the backrest plate. Theventilating system for the child safety seat is simple and compact in structure, small in occupied space, and good in ventilating effect; the comfort level of the child safety seat in use can be improved.