A car safety seat includes a seat body and at least one safety belt. The seat body has at least one slot structure, wherein the slot structure includes a plurality of positioning slots and a plurality of guiding slots. The positioning slots are arranged with intervals in sequence, wherein each of the positioning slots has a first section and a second section opposite to each other. Each of the positioning slots is connected with another adjacent one of the positioning slots through one of the guiding slots, and each of the guiding slots extends from the first section of one of the positioning slots to the second section of another adjacent one of the positioning slots. The safety belt penetrates through any one of the positioning slots, wherein the safety belt is adapted to move along the corresponding guiding slot to reach another adjacent one of the positioning slots. |