A child car seat comprising: a seat body; a headrest connected to said seat body; a first seat belt and a second seat belt disposed on said seat body; a first shoulder pad unit, wherein said first shoulder pad unit comprises a first shoulder pad that is connected to said first seat belt, and a first connecting strap that interconnects said first shoulder pad and said headrest; and a second shoulder pad unit, wherein said second shoulder pad unit comprises a second shoulder pad that is connected to said second seat belt, and a second connecting strap that interconnects said second shoulder pad and said headrest; wherein each of said first and second shoulder pads is sleeved on a portion of a respective one of said first and second seat belts; wherein said first and second connecting strap each comprises a first end that is connected fixedly to said corresponding first and second shoulder pad, respectively; wherein said headrest is provided with respective first and second through holes spaced apart from each other in a left-right direction, wherein each of said first and second connecting straps comprises a second end that is opposite to said respective first end and extends through the respective first or second through hole, characterised in that said headrest is vertically movable with respect to said seat body, and each of said first and second shoulder pad units is connected co-movably with said headrest as said headrest moves vertically; and in thatsaid first or second shoulder pad unit further comprises a hook-and-loop fastener unit or a releasable buckle mechanism provided on two ends of said respective first or second shoulder pad for fastening releasably said two ends of said respective first or second shoulder pad together to form a sleeve that is sleeved on said respective first or second seat belt. a seat body; a headrest connected to said seat body; a first seat belt and a second seat belt disposed on said seat body; a first shoulder pad unit, wherein said first shoulder pad unit comprises a first shoulder pad that is connected to said first seat belt, and a first connecting strap that interconnects said first shoulder pad and said headrest; and a second shoulder pad unit, wherein said second shoulder pad unit comprises a second shoulder pad that is connected to said second seat belt, and a second connecting strap that interconnects said second shoulder pad and said headrest; wherein each of said first and second shoulder pads is sleeved on a portion of a respective one of said first and second seat belts; wherein said first and second connecting strap each comprises a first end that is connected fixedly to said corresponding first and second shoulder pad, respectively; wherein said headrest is provided with respective first and second through holes spaced apart from each other in a left-right direction, wherein each of said first and second connecting straps comprises a second end that is opposite to said respective first end and extends through the respective first or second through hole, characterised in that said headrest is vertically movable with respect to said seat body, and each of said first and second shoulder pad units is connected co-movably with said headrest as said headrest moves vertically; and in thatsaid first or second shoulder pad unit further comprises a hook-and-loop fastener unit or a releasable buckle mechanism provided on two ends of said respective first or second shoulder pad for fastening releasably said two ends of said respective first or second shoulder pad together to form a sleeve that is sleeved on said respective first or second seat belt.