Disclosed are a carton box and a carton box blank. The carton box blank comprises side wall blank surfaces (1), which are used for forming side walls of a carton box in an enclosing manner and are sequentially arranged, and a lap joint surface (2), which is connected to a side wall blank surface of a tail end and used for connecting the side wall blank surfaces of the head and of the tail, wherein two sides of each side wall blank surface are respectively connected to roll covers (3); the roll covers on the same side are folded to form the bottom surface or the top surface of the carton box; first flaps (5) are mutually connected between adjacent roll covers on the same side; second flaps (15) are connected between the adjacent roll covers by means of lap joint surfaces and a lap joint relationship; a flap forward folding line (9) is provided at the joint between each flap and one of the adjacent roll covers; a flap reverse folding line (10) is provided at the joint between each flap and the other adjacent roll cover; through holes (6) are provided at intersection positions of the flap forward folding line and flap reverse folding line; and the carton box is formed on the basis of the carton box blank.