Abstract: The digging bits system contains left, right and central cylindrical digging bits and left and right plate digging bits being installed between the cylindrical digging bits, respectively. To the cylindrical digging bits, percussion force and turning force are applied. Each of the cylindrical digging bit contains tip, intermediate and upper end tubular body and is provided with a pore therein, respectively. To each of the tip tubular body, a bit edge is fixed, respectively. To both of the upper and the under end sides of the middle tubular body, a cam is provided in one unit with the tubular body, respectively. Each of the plate digging bits contains a sleeve, a central sleeve and a plurality of bit pieces, respectively. The cylindrical digging bits are rotatably connected with each other via a connecting member.