The present application discloses a fireproof buffering structure which includes a buffering plate and a fireproof plate attached thereto. A combustion rate of the fireproof plate is lower than that of the buffering plate. In contrast to conventional buffering structures, the fireproof buffering structure adopts the combined buffering plate and fireproof plate. The buffering plate has good impact absorbing capacity for providing a soft and comfortable seating environment and buffering and protection effects during a crash accident, and the fireproof plate can reduce the combustion rate of the integral structure when catching fire. Therefore, the fireproof buffering structure achieves the purposes of safety and comfort. The present application further discloses a supporting cushion apparatus which includes a covering member and the aforementioned fireproof buffering structure accommodated therein. The present application further discloses a child safety car seat which includes the aforementioned fireproof buffering structure and the aforementioned supporting cushion apparatus.