An anchor bolt assembly having an upper part configured to be fixed to a ceiling slab comprising an installation hole and a lower configured to be coupled to a channel bar, said anchor bolt assembly comprising: an anchor body provided with a plurality of pointed protrusions on an upper surface thereof; an anchor shell provided with open upper and lower sides thereof, extrapolated to a lower side of the anchor body, provided with a first incised part having a "Y" shape at an equal interval along a circumference of the anchor shell, and a tightening member the anchor bolt assembly being characterized in that the anchor body is provided with a double stepped jaw having a side of a "angle brackets" "< >" shape, as an outer diameter thereof widens downward from an upper end of the anchor body and then narrows downward again; the anchor shell is provided with a second incised part having a "v" shape at an equal interval along a longitudinal direction of the first incised part; and that the tightening member being screwed to the anchor body through a screw thread provided on an inner circumferential surface of the tightening member, tightening and allowing the double stepped jaw of the anchor body to be inserted into the anchor shell so as to expand an expansion piece, and being provided with a processing part for increasing frictional force along a circumference of an upper end of the tightening member, and that when the anchor shell is raised toward a deepest part of an installation hole by the tightening member, due to a structure of the "angle brackets" "<>" shape of the double stepped jaw of the anchor body and a structure of a "circumflex symbol" "^" shape of the deepest part of the installation hole, the first incised part of the anchor shell is opened to left and right in a form of "angle brackets" "<>" so that an upper part of the anchor shell is bent and gathered toward a triangular pyramid protrusion of the anchor body, at this time, the second incised part of the anchor shell positioned on a wall side of the installation hole has the same shape as a barb and this barb-shaped part is drilled into a wall of the installation hole, thereby strongly fixing the anchor shell to the wall. an anchor body provided with a plurality of pointed protrusions on an upper surface thereof; an anchor shell provided with open upper and lower sides thereof, extrapolated to a lower side of the anchor body, provided with a first incised part having a "Y" shape at an equal interval along a circumference of the anchor shell, and a tightening member the anchor bolt assembly being characterized in that the anchor body is provided with a double stepped jaw having a side of a "angle brackets" "< >" shape, as an outer diameter thereof widens downward from an upper end of the anchor body and then narrows downward again; the anchor shell is provided with a second incised part having a "v" shape at an equal interval along a longitudinal direction of the first incised part; and that the tightening member being screwed to the anchor body through a screw thread provided on an inner circumferential surface of the tightening member, tightening and allowing the double stepped jaw of the anchor body to be inserted into the anchor shell so as to expand an expansion piece, and being provided with a processing part for increasing frictional force along a circumference of an upper end of the tightening member, and that when the anchor shell is raised toward a deepest part of an installation hole by the tightening member, due to a structure of the "angle brackets" "<>" shape of the double stepped jaw of the anchor body and a structure of a "circumflex symbol" "^" shape of the deepest part of the installation hole, the first incised part of the anchor shell is opened to left and right in a form of "angle brackets" "<>" so that an upper part of the anchor shell is bent and gathered toward a triangular pyramid protrusion of the anchor body, at this time, the second incised part of the anchor shell positioned on a wall side of the installation hole has the same shape as a barb and this barb-shaped part is drilled into a wall of the installation hole, thereby strongly fixing the anchor shell to the wall.