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; 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 that said headrest is formed with first and second through holes, one of said first and second connecting straps having a first end that is connected fixedly to one of said first and second shoulder pads, and a second end that is opposite to said first end and that extends through one of said first and second through holes, one of said first and second shoulder pad units further comprising a positioning member that is connected to said second end of one of said first and second connecting straps and that engages removably one of said first and second through holes so as to arrest separation of said second end of one of said first and second connecting straps from said headrest through one of said first and second through holes. 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; 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 that said headrest is formed with first and second through holes, one of said first and second connecting straps having a first end that is connected fixedly to one of said first and second shoulder pads, and a second end that is opposite to said first end and that extends through one of said first and second through holes, one of said first and second shoulder pad units further comprising a positioning member that is connected to said second end of one of said first and second connecting straps and that engages removably one of said first and second through holes so as to arrest separation of said second end of one of said first and second connecting straps from said headrest through one of said first and second through holes.